Victor misses front target (5)
I believe the answer is:
inner
'target' is the definition.
(I've seen this before)
'victor misses front' is the wordplay.
'victor' becomes 'winner' (synonyms).
'misses front' means to remove the first letter (I've seen 'missing front' mean this).
'winner' with its first letter taken off is 'INNER'.
(Other definitions for inner that I've seen before include "pretty good shot" , "More secret, private" , "Close to the centre; mental" , "red" , "Located inside" .)