Crossword Genius

Circulation noise (9)

Ross

I believe the answer is:

heartbeat

'circulation noise' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for heartbeat that I've seen before include "Animating force" , "Circulation noise" , "Essential pulsation" , "Pulse of cardiac origin" .)

I've seen this clue in The Sun.
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