Grant entertains retired minister in restaurant (7)
I believe the answer is:
carvery
'restaurant' is the definition.
(I know that carvery is a type of restaurant)
'grant entertains retired minister' is the wordplay.
'grant' becomes 'cary' (actor Cary Grant).
'entertains' means one lot of letters goes inside another.
'retired' is a reversal indicator.
'minister' becomes 'rev' (short for reverend).
'rev' written backwards gives 'ver'.
'cary' enclosing 'ver' is 'CARVERY'.
'in' is the link.
(Other definitions for carvery that I've seen before include "Buffet serving roast meats from the joint" , "where the main course is meat" , "Buffet serving sliced meat" , "cafe" , "likely to be hot at 19 across [REASTAURANT]" .)