It's cooked in ovens (7)

I believe the answer is:

venison

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'it's' is the definition.
I can't tell whether this defines the answer.

'cooked in ovens' is the wordplay.
'cooked' indicates an anagram (letters cooked into a new form).
'in'+'ovens'='inovens'
'inovens' anagrammed gives 'VENISON'.

Can you help me to learn more?

(Other definitions for venison that I've seen before include "Game" , "Deer meat" , "Flesh of deer" , "Type of meat" , "Meat - in ovens (anag)" .)

I've seen this clue in the Evening Standard.

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