Cat's complaint (4)
I believe the answer is:
meow
'cat's complaint' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for meow that I've seen before include "Beastly noise" , "reply to spiteful dig" , "Crying sound of an animal" , "Cat's cry" , "Tom's plea for attention" .)