Crossword Genius

Tardis sound effect, perhaps (5)

Ross

I believe the answer is:

thrum

(Other definitions for thrum that I've seen before include "Inexpressively play" , "Monotonous (or rhythmic) sound" , "Tap a beat with fingers" , "Strum monotonously" , "Drum incessantly" .)

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