Voices heard in paper, reportedly? (5)
I believe the answer is:
choir
'voices heard' is the definition.
(group of singers)
'paper reportedly?' is the wordplay.
'paper' becomes 'quire' (paper measurement).
'reportedly?' indicates a 'sounds like' (homophone) clue (I've seen 'reportedly' mean this).
'quire' is a homophone of 'CHOIR'.
'in' acts as a link.
(Other definitions for choir that I've seen before include "set of singers" , "Singers in harmony" , "Chorus in church" , "Organised group of singers" , "Body of singers" .)