Borge a winner? (6)
I believe the answer is:
victor
'winner?' is the definition.
('victor' can be a synonym of 'winner')
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for victor that I've seen before include "Competitor who's first" , "Winner; boy's name" , "Comms code for V" , "Winner in a contest" , "Champion" .)