Vocalist forced to resign (6)
I believe the answer is:
singer
'vocalist' is the definition.
(I know that vocalist can be written as singer)
'forced to resign' is the wordplay.
'forced' is an anagram indicator.
'resign' anagrammed gives 'SINGER'.
(Other definitions for singer that I've seen before include "Bass, say" , "choirboy?" , "Eg, tenor" , "Vocalist" , "Song performer" .)