Quietly, set for recreation (4)
I believe the answer is:
play
'for recreation' is the definition.
(play is a kind of recreation)
'quietly set' is the wordplay.
'quietly' becomes 'p' (p for piano and quiet).
'set' becomes 'lay' (both can mean to place something).
'p'+'lay'='PLAY'
(Other definitions for play that I've seen before include "Dramatic work" , "Freedom of movement" , "Have fun -- theatrical work" , "stage production" , "Theatrical performance" .)