Winner's strike (3)
I believe the answer is:
hit
This clue is a double definition.
'winner's' is the first definition.
(both can mean a successful creative venture)
'strike' is the second definition.
(hitting is a kind of striking)
(Other definitions for hit that I've seen before include "Popular song; strike" , "winner" , "Of a play, a smashing success" , "Chart topper" , "dose of illegal drug" .)