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Elementary particle (4)

Ross

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7 8

'elementary particle' is the definition.
(pion is a kind of elementary particle)

This is the entire clue.

(Other definitions for pion that I've seen before include "It carries strong force" , "Type of meson" , "Subatomic particle" , "something tiny" .)

I've seen this clue in The Guardian and the Sydney Morning Herald.
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