Crossword Genius

Gemini twin (6)

Ross

I believe the answer is:

castor

'gemini twin' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for castor that I've seen before include "Roller on chair" , "Small swivelling wheel on a furniture leg" , "Powdered sugar" , "Small swivelled wheel fixed to each leg of a piece of furniture" , "Brother to Pollux" .)

I've seen this clue in The Mirror, the L.A. Times Sunday and the L.A. Times Daily.
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