Guiding (8)
I believe the answer is:
steering
'guiding' is the definition.
(synonyms)
This is the entire clue.
(Other definitions for steering that I've seen before include "Guiding and directing, say a car" , "Guiding, directing the course" , "-- Committee; -- wheel" , "Mechanism that allows a vehicle to be guided" , "Controlling the direction" .)