Crossword Genius

Monotonous sound (5)

Ross

I think it could be either:

thrum

drone

(Other definitions for thrum that I've seen before include "Strum monotonously" , "Monotonously repeat" , "Tap a beat with fingers" , "Drum incessantly" , "Repetitive drone - end of weaver's thread" .)

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