Crossword Genius

Basic particle (4)

Ross

I believe the answer is:

atom

'basic particle' 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 "Very small bit" , "type of bomb" , "Smallest unit of matter" , "Bit of make-up" , "It was once thought to be smallest particle of matter" .)

I've seen this clue in the USA Today.
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