Looks like some blue VW master clyinder resivour tube would probably work.

The PROPER hose is press fit and thus you don't need a clamp. There is a barb on the end of that nipple that holds things on very well. After you put your new hose on, try to pull it off. Assuming it is the right stuff and has a cloth-like outer covering, you won't get it off.

And yes it goes to the clutch...found this one out a couple days ago