Turning mechanism going in either direction? (5)
I believe the answer is:
rotor
'turning mechanism' is the definition.
'rotor' can be an answer for 'mechanism' (rotor is a kind of mechanism). I'm unsure of the 'turning' bit.
'going in either direction?' is the wordplay.
'going in either' becomes 'roto' (I am not sure about this - if you are sure you should believe this answer much more).
'direction?' becomes 'r' (r is abbreviation for right).
'roto'+'r'='ROTOR'
Can you help me to learn more?
(Other definitions for rotor that I've seen before include "Revolver" , "Turner" , "Revolving bar" , "Distributor arm" , "Revolving part of a machine, a palindrome" .)