Crossword Genius

Hums like an engine (5)

Ross

I believe the answer is:

purrs

'hums like an engine' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for purrs that I've seen before include "Cats' noises" , "Feline sounds" , "Cat sounds" , "Cats' contented sounds" .)

I've seen this clue in the USA Today.
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