Set value of Expression

Here is a part of complete argument validation system I've wrote which validates user's given argument:

public void Validate<T>(Expression<Func<T>> argExpr, bool justClean) where T : IComparable, IComparable<T>, IConvertible, IEquatable<T>
{
    var expressionBody = (MemberExpression)argExpr.Body;
    var argName = expressionBody.Member.Name;
    var value = argExpr.Compile().Invoke();
    if(!justClean)
        //check above value against invalid values and throw exception
    else
        //clean the value and MY QUESTION: set member's value
}

Now we need to set that expression's member value to cleaned version of given value like this:

Validate(() => item.ItemName, true);

As a result I expect item.ItemName has a cleaned value which was set inside Validate method.

Please notice that we can't simply return that value as a function result, because of my code flow. So, is there any way to do this?