Purring pet (3)
I believe the answer is:
cat
'purring pet' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for cat that I've seen before include "Feline mammal" , "Pussy" , "Feline - whip" , "Carnivore; whip" , "Animal (domesticated or wild)" .)