Sow sound (4)
I believe the answer is:
oink
'sow sound' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for oink that I've seen before include "what we hear from Berkshire?" , "Piggy noise" , "Beastly sound" , "Sound from a sty" , "Piggish noise" .)