Arthur of the court (4)
I believe the answer is:
ashe
'arthur of the court' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for ashe that I've seen before include "Sporting champion once" , "He was good enough to win Wimbledon" , "tennis champ" , "US court star" , "Arthur, who came to court" .)