Cook unfinished kebab that's going off (4)
I believe the answer is:
bake
'cook' is the definition.
(I know that bake is a more specific form of cook)
'unfinished kebab that's going off' is the wordplay.
'unfinished' means to remove the last letter.
'that's going off' indicates anagramming the letters (letters go or move around).
'kebab' with its final letter taken off is 'keba'.
'keba' is an anagram of 'BAKE'.
(Other definitions for bake that I've seen before include "Cook (bread/cakes)" , "work in kitchen?" , "Cook in oven (or sun?)" , "Cook ,eg, a cake" , "Oven-cook" .)