Crossword Genius

Name on picture provides some illumination (6)

Ross

I believe the answer is:

photon

'some illumination' is the definition.
(a photon is a light particle)

'name on picture' is the wordplay.
'name' becomes 'n' (common abbreviation e.g. on forms).
'on' is a charade indicator (letters next to each other).
'picture' becomes 'photo' (a photograph).
'n' put after 'photo' is 'PHOTON'.

'provides' acts as a link.

(Other definitions for photon that I've seen before include "Quantum particle of light" , "A little light" , "Tiny bit of light" , "Quantum of electromagnetic radiation" .)

I've seen this clue in The Guardian.
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