Tennis icon Arthur (4)
I believe the answer is:
ashe
'tennis icon arthur' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for ashe that I've seen before include "He was good enough to win Wimbledon" , "US rallying champion" , "Arthur, first black Wimbledon men's singles champion, 1975" , "Ex-Wimbledon champ" , "Arthur ___, American tennis player 1943-1993" .)