Crossword Genius

Sound the strings of a guitar, say (5)

Ross

I believe the answer is:

thrum

(Other definitions for thrum that I've seen before include "Strum, hum or drum!" , "Play monotonously" , "Make a continuous humming sound" , "Make a rhythmic humming sound" , "Monotonous (or rhythmic) sound" .)

I've seen this clue in The Guardian.
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