Oven with leather opening (7)
I believe the answer is:
tandoor
'oven' is the definition.
(type of Asian oven)
'with leather opening' is the wordplay.
'with' means one lot of letters go next to another.
'leather' becomes 'tan' (tan can mean to convert into leather).
'opening' becomes 'door' (a door is an opening).
'tan'+'door' is 'TANDOOR'.
(Other definitions for tandoor that I've seen before include "It has food cooked" , "Indian oven" , "Clay oven" .)