Skill of tennis player, ace! (8)
I believe the answer is:
smashing
I believe this is a double definition.
'skill of tennis player' is the first definition.
(a smash is a type of shot in tennis)
'ace' is the second definition.
(I've seen this before)
(Other definitions for smashing that I've seen before include "Breaking violently into pieces" , "use for plates at a Greek wedding?" , "Fantastic" , "ace" , "Committing act of vandalism" .)