Oven dish (9)
I believe the answer is:
casserole
'oven dish' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for casserole that I've seen before include "Large cooking dish" , "Dish cooked in an earthenware pot" , "Stew-pan" , "Dish (served in a dish of the same name)" , "(Food cooked in a) stewpot" .)