Pet that purrs (5)
I believe the answer is:
kitty
'pet that purrs' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for kitty that I've seen before include "19 - diminutive name for girl or pet" , "Pool - 4 down" , "Cat; fund of money" , "potential winnings" , "One part of litter queen dropped" .)