Turning device that spins both ways? (5)
I believe the answer is:
rotor
This clue is a double definition.
'turning device' is the first definition.
(rotors turn around)
'that spins both ways?' is the second definition.
(Other definitions for rotor that I've seen before include "Turning part of a mechanism" , "System of turning helicopter blades" , "US state South of L. Erie" , "Turning component" , "device for lifting a chopper" .)