Oatmeal dish (8)
I believe the answer is:
porridge
'oatmeal dish' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for porridge that I've seen before include "Breakfast of boiled oatmeal and milk" , "Breakfast cereal dish" , "Eat for breakfast in prison" , "Hot breakfast food" , "type of bird" .)