German tennis great (4)
I believe the answer is:
graf
'german tennis great' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for graf that I've seen before include "Noted tennis player" , "Steffi --, tennis player" , "Seven-times women's Wimbledon champion, b. 1969" , "German tennis player, b. 1969" , "German count - German tennis player" .)