Motorist's club (6)
I believe the answer is:
driver
I believe this is a double definition.
'motorist's' is the first definition.
(I've seen this in another clue)
'club' is the second definition.
(type of golf club)
(Other definitions for driver that I've seen before include "Golf-club for a motorist" , "Motorist - golf club" , "Member of RAC" , "chauffeuse" , "Operator of a motor vehicle" .)