A heavenly twin (6)
'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" .)
'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" .)