Crossword Genius

A heavenly twin (6)

Ross

I think it could be either:

castor

pollux

'a heavenly twin' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for pollux that I've seen before include "One half of Gemini" , "Heavenly twin" , "In Greek myth, twin brother of Castor" , "Immortal twin brother of Castor" , "Bright star in constellation of Gemini, brother to Castor" .)

I've seen this clue in the Evening Standard.
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