Operatic star eager to return (4)
I believe the answer is:
diva
'operatic star' is the definition.
(diva is a kind of operatic star)
'eager to return' is the wordplay.
'eager' becomes 'avid' ('avid' can be a synonym of 'eager').
'to return' is a reversal indicator.
'avid' written backwards gives 'DIVA'.
(Other definitions for diva that I've seen before include "Avid like opera singer" , "Distinguished female singer" , "Operatic ego" , "Operatic soprano" , "One who sings" .)