Celebrity not entirely graceful (3)
I believe the answer is:
ace
'celebrity' is the definition.
(both can mean a star)
'not entirely graceful' is the wordplay.
'not entirely' says the answer is hidden in the clue.
'ACE' is hidden in the letters of 'graceful'.
(Other definitions for ace that I've seen before include "Tennis serve that the opponent can't reach" , "Possibly a diamond" , "fighter pilot" , "Excellent" , "unit > of highest quality" .)