Crossword Genius

Monotonous sound (5)

Ross

I think it could be either:

thrum

drone

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

This is the entire clue.

(Other definitions for drone that I've seen before include "Monotonous sound - member of hive" , "Talk boringly; a parasite" , "Low hum; parasite" , "Continuous sound; bee" , "Male bee for the queen" .)

I've seen this clue in The Mirror and the Sydney Morning Herald.
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