Tiller (4)
'tiller' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for helm that I've seen before include "Tiller, steering wheel" , "Steersman's place" , "Ship's steering apparatus" , "Tiller; old headgear" , "protection for nut once" .)
'tiller' is the definition.
(thesaurus)
This is all the clue.
(Other definitions for rudder that I've seen before include "It steers a ship" , "It is used to steer boat or plane" , "Boat's steering mechanism" , "Ship's steering plate" , "It is used to direct course of ship" .)