Crossword Genius

It turns up and down (5)

Ross

I believe the answer is:

rotor

This clue is a double definition.

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

'up and down' is the second definition.

(Other definitions for rotor that I've seen before include "Eddy" , "Turning part of machine, palindromic" , "Machine part that turns around" , "Revolving part of a machine, a palindrome" , "Helicopter supporter" .)

I've seen this clue in the Evening Standard.
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