Drone (3)

I think it could be either:

Which length description are you looking for?:

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 Sunday Times, the King Feature Syndicate, The Times, The Star Tribune, The Independent and The Telegraph.

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