The nominal winner (6)
I believe the answer is:
victor
'winner' is the definition.
(I know that winner can be written as victor)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for victor that I've seen before include "whiskey after this" , "The one who wins the battle" , "Meat; complain" , "Winner; boy's name" , "Winner in a contest" .)