Worker sees nothing for each musical rejected (9)
I believe the answer is:
operative
'worker' is the definition.
(thesaurus)
'nothing for each musical rejected' is the wordplay.
'nothing' becomes 'o' (looks like zero - 0).
'for each' becomes 'per' (I've seen this before).
'musical' becomes 'evita' (I've seen this before).
'rejected' shows that the letters should be reversed in order.
'evita' back-to-front is 'ative'.
'o'+'per'+'ative'='OPERATIVE'
'sees' acts as a link.
(Other definitions for operative that I've seen before include "Efficient" , "Functioning; worker" , "Working (person)" , "Significant" , "Having force - skilled worker" .)