Winning smash volley (6)
I believe the answer is:
lovely
'winning' is the definition.
(thesaurus)
'smash volley' is the wordplay.
'smash' indicates anagramming the letters.
'volley' is an anagram of 'LOVELY'.
(Other definitions for lovely that I've seen before include "Great!" , "Admirable" , "Fair" , "Attractive" , "Volley (anag.)" .)