Sound of a contented cat (4)

I believe the answer is:

purr

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

This is the entire clue.

(Other definitions for purr that I've seen before include "Express pleasure" , "Cat's coo" , "Sound of happy animal" , "Happy feline sound" , "Show pleasure" .)

I've seen this clue in the USA Today, The New York Times, the Family Time, the L.A. Times Daily, The Washington Post, The Times and The Guardian.

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