Crossword Genius

Smooth engine sound (4)

Ross

I believe the answer is:

purr

'smooth engine sound' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for purr that I've seen before include "Sound of contentment" , "Sound like happy cat" , "Express contentment" , "Show pleasure" , "Happy feline sound" .)

I've seen this clue in The Washington Post, the Universal, the LA Times, the L.A. Times Daily, the USA Today and the King Feature Syndicate.
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