Hog's sound (5)
I believe the answer is:
grunt
'hog's sound' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for grunt that I've seen before include "(Make the) sound of a pig" , "Oink" , "Beastly sound" , "Talk like a pig" , "Inarticulate sound" .)