Sound of bells (4)
I believe the answer is:
peal
'sound of bells' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for peal that I've seen before include "(Bells) ring" , "Deep prolonged sound" , "Prolonged sound of a bell" , "Loud burst of thunder - or laughter" , "Leap about to sound of bells" .)