Is proton decaying into antimatter? (8)
I believe the answer is:
positron
'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" .)