Cold meat pie with no base concerning Victor (8)
I believe the answer is:
champion
'victor' is the definition.
(I've seen this before)
'cold meat pie with no base concerning' is the wordplay.
'cold' becomes 'c' (eg on taps).
'meat' becomes 'ham' (ham is a kind of meat).
'with no base' means to remove the last letter (the bottom letter or base is removed).
'concerning' becomes 'on'.
'pie' with its final letter taken away is 'pi'.
'c'+'ham'+'pi'+'on'='CHAMPION'
(Other definitions for champion that I've seen before include "'Winner, title-holder (8)'" , "Advocate, defender" , "Defender of a cause" , "Tournament winner" , "Competitor who has defeated all others" .)