Quiet ballad providing entertainment (4)
I believe the answer is:
play
'entertainment' is the definition.
(I've seen this in another clue)
'quiet ballad' is the wordplay.
'quiet' becomes 'p' (music symbol for 'piano', ie soft or quiet).
'ballad' becomes 'lay' (synonyms).
'p'+'lay'='PLAY'
'providing' acts as a link.
(Other definitions for play that I've seen before include "Theatrical production" , "Theatre performance" , "Recreation" , "Freedom of movement" , "Theatrical performance" .)