Crossword Genius

Like a very heavy sleeper (8)

Ross

I believe the answer is:

comatose

(Other definitions for comatose that I've seen before include "Deeply unconscious" , "Come to as in drowsy condition" , "Fast asleep" , "In a drowsy or semi-conscious state" , "Senseless, unconscious" .)

I've seen this clue in The New York Times.
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