Wimbledon sport (6)
I believe the answer is:
tennis
'wimbledon sport' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for tennis that I've seen before include "Racket sport" , "Racket-and-ball game" , "Medieval, originally French, sport, codified by the British" , "Court-based sport" , "Wimbledon sport" .)