Orpheus finally coming to Stygian realm — in Ray-Bans? (6)

I believe the answer is:

shades

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'orpheus' is the definition.
Both the answer and definition are singular nouns.
Perhaps there's an association between them I don't understand?

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for shades that I've seen before include "suspicions" , "disguise, sometimes" , "Sunglasses, colloquially" , "Nuances" , "Slight differences between colours" .)

I've seen this clue in The Times.

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