Crossword Genius

Actor's miscast as one of heavenly twins (6)

Ross

I believe the answer is:

castor

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'one of heavenly twins' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.

'actor's miscast' is the wordplay.
'miscast' indicates an anagram.
'actors' with letters rearranged gives 'CASTOR'.

'as' acts as a link.

Can you help me to learn more?

(Other definitions for castor that I've seen before include "Small swivelled wheel fixed to each leg of a piece of furniture" , "Oil beloved by parents of old" , "Fur of the beaver" , "Brother to Pollux" , "excellent once at the Gabba" .)

I've seen this clue in The Globe and Mail.
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