Crossword Genius

Heartbeat regulator (9)

Ross

I believe the answer is:

pacemaker

(Other definitions for pacemaker that I've seen before include "Surgical implant" , "Implanted device to control the heartbeat" , "leader at the start" , "Device to regulate the heartbeat" , "Device inserted into chest to stimulate heart" .)

I've seen this clue in the Evening Standard.
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