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Extremely small (6)

Ross

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6

'extremely small' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for atomic that I've seen before include "Energy released in nuclear fission or fusion" , "Extremely minute" , "Extremely small-scale" , "Like nuclear energy" , "Referring to a tiny particle" .)

I've seen this clue in The Irish Times, the Newsday and The Guardian.
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