Motorist's club (6)
I believe the answer is:
driver
This clue is a double definition.
'motorist's' is the first definition.
(I've seen this before)
'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" .)