Crossword Genius

Physics bit (4)

Ross

I believe the answer is:

atom

'physics bit' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for atom that I've seen before include "Elementary particle" , "A tiny particle but a big bomb" , "Very small object or amount" , "Moat (anag.)" , "Particle of matter now divided" .)

I've seen this clue in the King Feature Syndicate.
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