Crossword Genius

Tall clock part (8)

Ross

I believe the answer is:

pendulum

(Other definitions for pendulum that I've seen before include "Weight hung from a fixed point to regulate a clock" , "Clock regulator" , "It swings from side to side - in a clock?" , "Oscillating mechanism" , "Vacillator" .)

I've seen this clue in The Guardian.
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