Result of soft-palate vibration (5)
I believe the answer is:
snore
'result of soft-palate vibration' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for snore that I've seen before include "thing which bores" , "How to keep someone awake while sleeping?" , "6 made by sleeper" , "Make racous nocturnal sound" , "Make noises sleeping" .)