slipping clutch, any cure?

[MustGoFaster]

You can try adjusting it. But it sounds fairly toast. If you had to sit in traffic or load it on a trailer recently, or in general do a lot of slipping the clutch in a short period of time, it might just be glazed. If it's glazed you will want to do a bit of aggressive driving with some quick to moderator fast shifts to try and break the glaze.