Pets that purr (4)

I believe the answer is:

cats

'pets that purr' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for cats that I've seen before include "Spectacular Llyod Webber feline musical" , "Carnivores - stage musical" , "Famous feline Lloyd Webber musical" , "Musical; animals" , "Some 6 Downs" .)

I've seen this clue in the Newsday.

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