Crossword Genius

Twin helps in moving furniture (6)

Ross

I believe the answer is:

castor

I'm a little stuck... Click here to teach me more about this clue!

This could be a double definition.

'twin helps' is the first definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe you can see a link between them that I can't see?

'moving furniture' is the second definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps there's an association between them I don't understand?

'in' acts as a link.

Can you help me to learn more?

(Other definitions for castor that I've seen before include "Chair wheel" , "Oil beloved by parents of old" , "excellent once at the Gabba" , "Twin to Pollux" , "Powdered sugar" .)

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