Sounds from sties (5)
I believe the answer is:
oinks
'sounds from sties' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for oinks that I've seen before include "High-pitched pig noises" , "Piggy noises" , "Beastly sounds" , "Grunts" , "beastly noise" .)