Type of food in a tin, cooked without opening (8)
I believe the answer is:
tandoori
'type of food' is the definition.
(style of Indian cooking)
'a tin cooked without opening' is the wordplay.
'cooked' indicates anagramming the letters (letters cooked into a new form).
'without' is an insertion indicator ('without' can be similar in meaning to 'outside').
'opening' becomes 'door' (a door is an opening).
'a'+'tin'='atin'
'atin' with letters rearranged gives 'tani'.
'tani' going around 'door' is 'TANDOORI'.
'in' is the link.
(Other definitions for tandoori that I've seen before include "Type of restaurant" , "Indian style of cooking" , "Cooked in an Indian clay oven" , "Tornado I found in Indian food" , "Style of Indian cookery" .)