Crossword Genius

Tiny matter? (4)

Ross

I believe the answer is:

atom

'tiny matter?' 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 "Moat (anag.)" , "A mighty particle, makes huge explosion" , "Minute fragment" , "Smallest particle in an element able to take part in a chemical reaction" , "A tiny particle of matter with a big bang" .)

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