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 in another clue)

This is all the clue.

(Other definitions for castor that I've seen before include "Powdered sugar" , "Superfine baker's sugar" , "Furniture wheel; sort of oil" , "Twin to Pollux" , "Oil beloved by parents of old" .)

I've seen this clue in the Evening Standard.
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