Purring pets (4)

I believe the answer is:

cats

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

This is the entire clue.

(Other definitions for cats that I've seen before include "1981 Lloyd Webber musical" , "Feline mammals" , "Musical from TS Eliot" , "Jaguars, say" , "Domestic pets" .)

I've seen this clue in the Newsday.com, the Wall Street Journal and The Sun.

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