Crossword Genius

Source of illumination (5,4)

Ross

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5,4

'source of illumination' is the definition.
(light bulb is a kind of source of illumination)

This is the entire clue.

(Other definitions for light bulb that I've seen before include "glower" , "that'll brighten your surroundings" , "Source of illumination" , "One should make things clear" , "(Electric) lamp" .)

I've seen this clue in The Guardian.
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