Musician's beat-keeper (9)

I believe the answer is:

metronome

(Other definitions for metronome that I've seen before include "Musician's time device" , "Device to help regulate tempo" , "A pacemaker" , "Ticker setting tempo of music" , "Musical timekeeper" .)

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

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.