Farmyard noises (5)
I believe the answer is:
oinks
'farmyard noises' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for oinks that I've seen before include "Grunts" , "Noises from pens" , "Piggy noises" , "High-pitched pig noises" , "Beastly sounds" .)