Meat can be a sin, put in the wrong oven (7)
I believe the answer is:
Here is my best explanation:
'meat' is the definition.
(venison is a kind of meat)
'can be a sin put in the wrong oven' is the subsidiary indication.
'can be' indicates anagramming the letters.
'put in' indicates putting letters inside.
'the wrong' indicates an anagram.
'sin' with letters rearranged gives 'nis'.
'oven' with letters rearranged gives 'veon'.
'nis' placed into 'veon' is 'venison'.
(Other definitions for venison that I've seen before include "Deer flesh", "Deer meat", "Deer (as food)", "In ovens (anag.)", "Flesh of deer", "Type of meat", "Meat - in ovens (anag)", "Game" and "Meat of a deer".)