Crossword Genius

In a flash, neutron moves lower in part of an atom (6)

Ross

I believe the answer is:

proton

'part of an atom' is the definition.

I can't explain the rest of the clue.

(Other definitions for proton that I've seen before include "Stable subatomic particle" , "Particle in atom nucleus" , "Positive thing" , "One is positive" , "One charged" .)

I've seen this clue in The Guardian.
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