Helm for turn (5)
I believe the answer is:
wheel
I believe this is a double definition.
'helm' is the first definition.
(I know that wheel is a type of helm)
'for turn' is the second definition.
(I've seen this before)
(Other definitions for wheel that I've seen before include "Fly in a wide circle" , "No need to re-invent it!" , "ring" , "Ship's steering device" , "Cog" .)