Dish, starter from Berry in bake off (5)
I believe the answer is:
kebab
'dish' is the definition.
(kebab is a kind of dish)
'starter from berry in bake off' is the wordplay.
'starter from' says to take the initial letters.
'in' means one lot of letters goes inside another.
'off' indicates anagramming the letters.
The initial letter of 'berry' is 'b'.
'bake' with letters rearranged gives 'keab'.
'b' inserted inside 'keab' is 'KEBAB'.
(Other definitions for kebab that I've seen before include "what one may spit" , "Cubes of meat on a skewer" , "Shish dish" , "Small pieces of meat and veg cooked on a skewer" , "Small pieces of meat and vegetables cooked on skewer" .)