Had a spare from my old
Golf and it didn’t fit the rear, have found a site that do a spare just for the club sport but it’s £300 !
VW would charge you £300 for a space saver including jack and tool kit for a Golf (ex Clubsport) if specified as an option when ordering a new car. It always costs more adding genuine OEM parts to an existing car (alloy wheels is a good example), so if you were to get a VW dealership parts department to price up a space saver spare, securing bolt, plus jack, tool kit and polystyrene/ foam type tray for the jack / toolkit you’d be in for a shock!
Therefore £300 for a (presumably) non-OEM brand new spare specifically for a Clubsport is probably the going rate.