Crossword Genius

Is proton decaying into antimatter? (8)

Ross

I believe the answer is:

positron

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'antimatter?' is the definition.
Both the definition and answer are singular nouns.
Perhaps they are linked in a way I don't understand?

'is proton decaying' is the wordplay.
'is proton' anagrams to 'POSITRON'.
Though, I'm not sure how the anagram is indicated.

'into' acts as a link.

Can you help me to learn more?

(Other definitions for positron that I've seen before include "possible contributor to annihilation" , "Sub-atomic particle" , "Elementary particle with positive charge" , "Charged particle" , "there's a small charge here" .)

I've seen this clue in The Independent.
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