Society concerned with G & S arias? (5)
I believe the answer is:
songs
'arias?' is the definition.
(aria is a kind of song)
'society concerned with g s' is the wordplay.
'society' becomes 's' (common abbreviation in names of organisations).
'concerned with' becomes 'on' (I've seen this in other clues**).
's'+'on'+'g'+'s'='SONGS'
(Other definitions for songs that I've seen before include "Anthems" , "Musical compositions with words" , "Words with music" , "Melodies with words" , "Vocal compositions" .)