Crossword Genius

Fishy fellow, but he shines (3)

Ross

I believe the answer is:

ray

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'fishy' is the definition.
(type of fish)

I can't explain the remainder of the clue.

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(Other definitions for ray that I've seen before include "Beam or flatfish" , "Narrow beam of light" , "Flat fish or sun beam" , "bit of sunshine" , "Sunbeam or flat fish" .)

I've seen this clue in the Evening Standard.
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