Stadium in the Billie Jean King National Tennis Center (4)
I believe the answer is:
ashe
'stadium in the billie jean king national tennis center' 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 "Ex-Wimbledon champ" , "Former tennis star" , "Arthur ___, American tennis player 1943-1993" , "Arthur, who came to court" , "Sporting champion once" .)