Part of oven is only for meat (7)
I believe the answer is:
venison
'for meat' is the definition.
(venison is a kind of meat)
'part of oven is only' is the wordplay.
'part of' says the answer is hidden in the clue.
'VENISON' can be found hidden inside 'oven is only'.
(Other definitions for venison that I've seen before include "Deer meat" , "Flesh of deer" , "Deer (as food)" , "Meat - in ovens (anag)" , "Game" .)