Doctors take it to heart (11)

I believe the answer is:

stethoscope

'doctors take it to heart' is the definition.
(doctors press a stethoscope to the heart)

This is all the clue.

(Other definitions for stethoscope that I've seen before include "Medical instrument" , "Doctor's instrument" , "Instrument used in listening" , "listening device" .)

I've seen this clue in The Globe and Mail.

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