Anonymous type conversion issue with Entity Framework 4 and Web Api

I am fleshing out my data access layer and have run into my first issue. I am using Entity Framework code first along with some repositories and asp.net web api to surface the data in json format.

I am trying to get data from two different poco's served up in a get method. The models are these:

public class Freelancer
{
    public int ID { get; set; }
    public string Email { get; set; }
    public string Password { get; set; }
    public string FirstName { get; set; }
    public string LastName { get; set; }
    public string CompanyName { get; set; }
    public string Avatar { get; set; }
    public Address FreelancerAddress { get; set; }
    public ICollection<Client> Clients { get; set; }
}

and address:

public class Address
{
    public int AddressId { get; set; }
    public string Street { get; set; }
    public string City { get; set; }
    public string State { get; set; }
    public string PostalCode { get; set; }
    public string Phone { get; set; }
    public string Email { get; set; }
}

and finally the list of Client objects:

public class Client
{
    public int ID { get; set; }
    public string Name { get; set; }
    public Address ClientAddress { get; set; }
    public string Logo { get; set; }
    public ICollection<Project> Projects { get; set; }
    public int FreelancerID { get; set; }
    public Freelancer Freelancer { get; set; }
}

In my Api Controller I am trying to do something like this (simplified for this question):

public IEnumerable<Freelancer> Get()
    {
        var user = Uow.Freelancers.GetFreelancer(1);
        var result = from x in user
                     select new
                     {
                         ID = x.ID,
                         Name = x.LastName,
                         Address = x.FreelancerAddress.Street
                     };
        return result;
    }

The error I get is this:

Cannot implicitly convert type 'System.Collections.Generic.IEnumerable' to 'System.Collections.Generic.IEnumerable'. An explicit conversion exists (are you missing a cast?)

I can return just the Freelancer object just fine, but in the Json it will show null for address and clients, even though there is related data. Is there a way to get the objects I need using linq, or should I do some kind of re-design of my DAL. I am in the beginning stages so I am looking for a best practice suggestion if you have one.

Additional Info

This is what gets served up from Uow.Freelancer.GetFreelancer(1);

[{"iD":1,"email":"[email protected]","password":"password","firstName":"David","lastName":"Stanley","companyName":null,"avatar":null,"freelancerAddress":null,"clients":null}]

GetFreelancer() looks like this:

public IEnumerable<Freelancer> GetFreelancer(int id)
    {
        IEnumerable<Freelancer> freelancer = (from x in DbSet
                         select x);
        return freelancer;
    }

I don't see any way to use .Reference or .Include, but that may be the right track. I remember doing something like that a few projects ago...

It works!!*

Here is what needed to happen:

I changed the GetFreelancer method to this:

IEnumerable<Freelancer> freelancer = from x in DbSet
                                     .Include("FreelancerAddress")
                                     .Include("Clients")
                                             where x.ID == id
                                             select x;

        return freelancer;

Which did not work at first because Freelancer was referencing Client which had a full reference to Freelance, so it tunnelled forever. I removed the reference in Client so it looks like this instead:

public class Client
{
    public int ID { get; set; }
    public string Name { get; set; }
    public Address ClientAddress { get; set; }
    public string Logo { get; set; }
    public ICollection<Project> Projects { get; set; }
    public int FreelancerID { get; set; }
}

And my output is exactly what I needed: A freelancer and his address, with a list of his clients.