Sampras of tennis (4)
I believe the answer is:
pete
'sampras of tennis' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for pete that I've seen before include "- Sampras, tennis star" , "filmed with his 1 across [DRAGON]" , "- Seeger, US folk singer" , "Small 14 [PETER JONES]" , "For his sake" .)