Cat's contented sound (4)

I believe the answer is:

purr

'cat's contented sound' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for purr that I've seen before include "Make low, contented sound" , "Show pleasure" , "Tiddles' sound" , "Sound like happy cat" , "Sound of happy animal" .)

I've seen this clue in the Family Time, The Telegraph and The Guardian.

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