clipper denotes the bodykit on the car. Karmann built the cab, another company produced the clipper bodykit for the face life models as the cab was looking dated to run along side the big bumper MKII golfs. the amount of ads you will see with GTI clipper cab on used to throw people.
clipper is your insurance friendly carb 90bhp 1800 the late ones 91 onwards had electric windows and electric roof, they have similar trim except they dont have the onboard computer and the wing mirrors are not colour coded. GTI being injected to allow 112bhp. they both share the clipper kit.