Chopper blade (5)

I believe the answer is:

rotor

'chopper blade' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for rotor that I've seen before include "Turning motor part" , "part of chopper" , "Revolving aerofoil" , "System of turning helicopter blades" , "Spinner" .)

I've seen this clue in the LA Times, The Sun, the Universal and The Globe and Mail.

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