Domestic animal (3)
'domestic animal' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for cat that I've seen before include "one's pyjamas? They're an excellent thing" , "Pussy" , "Tiger, for instance" , "Grimalkin" , "Malicious gossip" .)
'domestic animal' is the definition.
(animal kept in the home)
This is the entire clue.
(Other definitions for pet that I've seen before include "Little darling" , "Favourite, darling" , "Paddy" , "Domesticated animal" , "Preferred" .)