Crossword Genius

Particle of matter (4)

Ross

I believe the answer is:

atom

'particle of matter' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for atom that I've seen before include "A tiny powerful particle" , "Smallest unit of matter" , "A tiny particle of matter with a big bang" , "Something very small perhaps" , "Moat (anag.)" .)

I've seen this clue in The Irish Times, The Mirror and the Evening Standard.
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