Sty sounds (5)
I believe the answer is:
oinks
'sty sounds' 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 "beastly noise" , "Noises from pens" , "Beastly sounds" , "High-pitched pig noises" , "Piggy noises" .)