Crossword Genius

Molecule part (4)

Ross

I believe the answer is:

atom

'molecule part' is the definition.
('atom' is part of 'molecule')

This is all the clue.

(Other definitions for atom that I've seen before include "A tiny powerful particle" , "Moat (anag.)" , "Piece of matter in moat" , "Scrap" , "Bit of make-up" .)

I've seen this clue in the Universal, the LA Times, the Newsday, the USA Today, The Star Tribune, the Penny Press, The Wall Street Journal and the King Feature Syndicate.
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