Crossword Genius

Drone (3)

Ross

I believe the answer is:

hum

'drone' is the definition.
(drone can mean to make a humming sound)

This is the entire clue.

(Other definitions for hum that I've seen before include "Drone - stink" , "Sing with the mouth shut" , "Smell strongly" , "Make musical sound with closed lips" , "Sound of busy activity" .)

I've seen this clue in The Telegraph and The Sunday Times.
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