Crossword Genius

Fire on all cylinders (3)

Ross

I believe the answer is:

hum

'fire on all cylinders' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for hum that I've seen before include "Drone - stink" , "Sound of busy activity" , "Reek" , "Stench" , "Buzz; stink" .)

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