Performer is keen to return (4)
I believe the answer is:
diva
'performer' is the definition.
(diva is a kind of performer)
'keen to return' is the wordplay.
'keen' becomes 'avid' (I've seen this before).
'to return' shows that the letters should be reversed in order.
'avid' written backwards gives 'DIVA'.
'is' is the link.
(Other definitions for diva that I've seen before include "Grand female singer" , "For example Sutherland" , "fat lady?" , "High-maintenance opera singer?" , "A female opera singer" .)