Tabby's sound (4)
I believe the answer is:
meow
'tabby's sound' 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" , "Cry of a cat" , "Cat's cry" , "Catty remark" , "reply to spiteful dig" .)