Crossword Genius

Part of the heart — clever nit (anag) (9)

Ross

I believe the answer is:

ventricle

(Other definitions for ventricle that I've seen before include "Chamber in organ of body - the heart has two" , "One of four heart chambers" , "Heart cavity that pumps blood to arteries" , "bloody pump!" .)

I've seen this clue in The Guardian.
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