Crossword Genius

What goes round and round without changing? (5)

Ross

I believe the answer is:

rotor

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If this is the answer I cannot explain how the clue works.

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(Other definitions for rotor that I've seen before include "Revolving blade (as on helicopter)" , "Dynamo part" , "It goes around" , "Revolving dynamic part" , "I go round" .)

I've seen this clue in The Independent.
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