Crossword Genius

Boat engine's whir (5)

Ross

I believe the answer is:

thrum

(Other definitions for thrum that I've seen before include "Rhythmic buzzing sound - fringe left after weaving" , "Single thread" , "go on and on" , "Drum with fingers - bits of coarse yarn" , "Play monotonously" .)

I've seen this clue in the Universal.
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