Call at Wimbledon (3)
I believe the answer is:
let
'call at wimbledon' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for let that I've seen before include "Allow; leased" , "Rent out (property)" , "Umpire's decision" , "& 15 Triple (anag.)" , "Allow on the tennis court" .)