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Extremely small (6)

Ross

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4

6

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">extremely small</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>

(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, The Guardian and the Penny Press.
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