Castor and Pollux (6)

I believe the answer is:

gemini

'castor and pollux' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for gemini that I've seen before include "Twins constellation" , "Heavenly sign of the Twins" , "Castor and Pollux constellation" , "House" , "star group" .)

I've seen this clue in The Irish Times.

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