Crossword Genius

Helicopter part (5)

Ross

I believe the answer is:

rotor

'helicopter part' is the definition.
('rotor' is part of 'helicopter')

This is the entire clue.

(Other definitions for rotor that I've seen before include "Turning part of a mechanism" , "Mechanical part that revolves, an acronym" , "Revolving arm in machine" , "Revolving blade (as on helicopter)" , "Mechanical turning part" .)

I've seen this clue in The Wall Street Journal, the Penny Press and The Mirror.
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