Meat processed in ovens (7)
I believe the answer is:
venison
'meat' is the definition.
(venison is a kind of meat)
'processed in ovens' is the wordplay.
'processed' indicates anagramming the letters.
'in'+'ovens'='inovens'
'inovens' anagrammed gives 'VENISON'.
(Other definitions for venison that I've seen before include "Game" , "Flesh of deer" , "Meat - in ovens (anag)" , "Type of meat" , "Deer meat" .)