Fat baker's cooked meal (9)
I believe the answer is:
breakfast
'meal' is the definition.
(I know that breakfast is a type of meal)
'fat baker's cooked' is the wordplay.
'cooked' is an anagram indicator (letters cooked into a new form).
'fat'+'bakers'='fatbakers'
'fatbakers' anagrammed gives 'BREAKFAST'.
(Other definitions for breakfast that I've seen before include "food" , "something to eat" , "Morning meal" , "Eat in the morning" , "See 5" .)