Crossword Genius

He's brainy, using no bin! (3)

Ross

I believe the answer is:

ray

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'he's' is the definition.

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(Other definitions for ray that I've seen before include "Column of light on the fish?" , "Narrow beam of light" , "A bright beam or flat fish" , "Lindwall" , "A little light" .)

I've seen this clue in the Evening Standard.
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