Victor's wife leaving ring circling bull (5)
I believe the answer is:
inner
'ring circling bull' is the definition.
(ring circling the bullseye on a target)
'victor's wife leaving' is the wordplay.
'victor' becomes 'winner' (synonyms).
'wife' becomes 'w'.
'leaving' indicates named letters should be taken away.
'winner' with 'w' taken away is 'INNER'.
(Other definitions for inner that I've seen before include "Annulus nearest bull" , "Target next to the bull's-eye on a dart board" , "Good shot at archery" , "It's next to the bull on the board" , "just missing the gold" .)