A club for the motorist (6)
I believe the answer is:
driver
I believe this is a double definition.
'a club' is the first definition.
(type of golf club)
'motorist' is the second definition.
(I've seen this before)
'for the' acts as a link.
(Other definitions for driver that I've seen before include "Member of RAC" , "Golf club; chauffeur" , "Golf-club for a motorist" , "Operator of a motor vehicle" , "Type of golf club" .)