Victor missing first target (5)
I believe the answer is:
inner
'target' is the definition.
(I've seen this before)
'victor missing first' is the wordplay.
'victor' becomes 'winner' (synonyms).
'missing first' means to remove the first letter.
'winner' with its first letter taken off is 'INNER'.
(Other definitions for inner that I've seen before include "Bull's penned in by this" , "Essential - most private" , "Deep" , "Located or occurring closer to a centre" , "Inside; next to the bull (archery)" .)