Device which may be programmed by a cardiac electrophysiologist (9)
I believe the answer is:
pacemaker
'device' is the definition.
(pacemaker is a kind of device)
'may be programmed by a cardiac electrophysiologist' is the wordplay.
I cannot quite understand how this works, but
'be' could be 'make' (making is a kind of being) and 'make' is found in the answer.
'a' is present in the answer.
This explanation may well be incorrect...
'which' is the link.
Can you help me to learn more?
(Other definitions for pacemaker that I've seen before include "the first in race" , "(Device to act as) control of heart rhythm" , "leader at the start" , "Electrical device put in heart to stimulate pulse" , "Implanted device to control the heartbeat" .)