Elementary particles (9)
I believe the answer is:
neutrinos
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">elementary particles</span>' is the definition.<br/ ><span class="explanation-format__explanation">(neutrino is a kind of elementary particle)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Another definition for neutrinos that I've seen is " Particles".)
I've seen this clue in the Sydney Morning Herald.
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