Star not entirely graceful (3)
I believe the answer is:
ace
'star' is the definition.
('ace' can be a synonym of 'star')
'not entirely graceful' is the wordplay.
'not entirely' indicates the answer is hidden within the clue.
'ACE' can be found hidden inside 'graceful'.
(Other definitions for ace that I've seen before include "reason for point of no return" , "Great" , "Unreturnable serve" , "SERVE?] that's non-returnable" , "Playing card with single spot" .)