Golf club's chauffeur (6)
I believe the answer is:
driver
I believe this is a double definition.
'golf club's' is the first definition.
(type of golf club)
'chauffeur' is the second definition.
(I know that chauffeur can be written as driver)
(Other definitions for driver that I've seen before include "Type of golf club" , "See 1 down" , "Golf club; chauffeur" , "Golf-club for a motorist" , "Motorist - golf club" .)