Crossword Genius

Propeller noise (4)

Ross

I believe the answer is:

whir

'propeller noise' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for whir that I've seen before include "Soft swishing sound" , "Make a humming noise" , "Spin with a humming sound" , "Prolonged buzz" , "Rotate with hum" .)

I've seen this clue in the L.A. Times Daily and the LA Times.
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