Crossword Genius

It turns backwards and forwards (5)

Ross

I believe the answer is:

rotor

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'it turns' is the definition.
(I've seen this before)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for rotor that I've seen before include "Eddy" , "Mechanical turning part" , "Chopper blade" , "Turning component" , "Machine part that turns around" .)

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