Quiet song soprano performs on guitar? (5)
I believe the answer is:
plays
'performs on guitar?' is the definition.
(as in playing a guitar)
'quiet song soprano' is the wordplay.
'quiet' becomes 'p' (music symbol for 'piano', ie soft or quiet).
'song' becomes 'lay' (lay is a kind of song).
'soprano' becomes 's' (musical abbreviation).
'p'+'lay'+'s'='PLAYS'
(Other definitions for plays that I've seen before include "Frolics" , "Dramatist's works" , "Dramas" , "Dramatic works" , "Theatrical works" .)