Crossword Genius

Sickening sound of a chicken (4)

Ross

I believe the answer is:

foul

'sickening' is the definition.
(synonyms)

'sound of a chicken' is the wordplay.
'sound of' shows a homophone (sound like).
'a chicken' becomes 'fowl' (I've seen this before).
'fowl' sounds like 'FOUL'.

(Other definitions for foul that I've seen before include "Offensive; make dirty" , "Vile" , "Putrid" , "Abhorrent" , "Repulsive" .)

I've seen this clue in the Sydney Morning Herald.
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