American idiot's back making posh belly of veal for main course (7)

I haven't cracked this one yet — but the brilliant team at Fifteensquared have:

Doofus<(=American idiot) with the U(=posh) replaced by [v]ea[l]. "Main course" could either be interpreted as a the principal course of the meal or as food coming from the "main"(=sea).