Victor’s woman? Secret (6)
I believe the answer is:
winner
'victor's' is the definition.
(synonyms)
'woman? secret' is the wordplay.
'woman?' becomes 'w' (abbreviation eg in Woman Police Constable).
'secret' becomes 'inner' (I've seen this in another clue).
'w'+'inner'='WINNER'
(Other definitions for winner that I've seen before include "film director" , "Victor" , "success" , "Top player" , "One succeeds" .)