Little bell's sound (4)
I believe the answer is:
ting
'little bell's sound' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for ting that I've seen before include "Sharp ring" , "Sound of a small bell" , "-- -a-ling" , "Ding or ring" , "Ring (a small bell)" .)