Bake off British dish (5)
I believe the answer is:
kebab
'dish' is the definition.
(kebab is a kind of dish)
'bake off british' is the wordplay.
'off' indicates anagramming the letters.
'british' becomes 'b' (abbreviation e.g. in BBC).
'bake' is an anagram of 'keba'.
'keba'+'b'='KEBAB'
(Other definitions for kebab that I've seen before include "Food grilled on a skewer" , "Meat and/or vegetables cooked on skewer" , "what one may spit" , "Brochette" , "Meat dish served on skewers" .)