Tempo-keeping device (9)

I believe the answer is:

metronome

(Other definitions for metronome that I've seen before include "Device to indicate tempo" , "Musician's time device" , "Device for keeping time" , "Musical timekeeper" , "Device to help regulate tempo" .)

I've seen this clue in The Independent.

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.