Possibly resigns from the choir (7)
I believe the answer is:
singers
'the choir' is the definition.
(a choir is a group of singers)
'possibly resigns' is the wordplay.
'possibly' indicates anagramming the letters.
'resigns' anagrammed gives 'SINGERS'.
'from' acts as a link.
(Other definitions for singers that I've seen before include "See 26" , "eg Tenors" , "Chorus" , "Eg, choir members" , "Choristers" .)