Avid sort of performer (4)
I believe the answer is:
diva
'performer' is the definition.
(diva is a kind of performer)
'avid sort' is the wordplay.
'sort' indicates anagramming the letters.
'avid' anagrammed gives 'DIVA'.
'of' is the link.
(Other definitions for diva that I've seen before include "Callas, say" , "One who sings" , "Celebrated female operatic star" , "For example Sutherland" , "Prima dona" .)