Recasts failing performer (7)
I believe the answer is:
actress
'performer' is the definition.
(actress is a kind of performer)
'recasts failing' is the wordplay.
'failing' indicates an anagram.
'recasts' is an anagram of 'ACTRESS'.
(Other definitions for actress that I've seen before include "One on stage" , "Stage performer" , "Casters (anag.)" , "One playing" , "Theatrical female" .)