Singing group's papers picked up (5)
I believe the answer is:
choir
'singing group's' is the definition.
(I've seen this in another clue)
'papers picked up' is the wordplay.
'papers' becomes 'quire' (I've seen this in other clues).
'picked up' indicates a 'sounds like' (homophone) clue.
'quire' is a homophone of 'CHOIR'.
(Other definitions for choir that I've seen before include "Body of singers" , "Chorus in church" , "Vocal group" , "Group of singers, often in church" , "Large group of singers" .)