Well, if the clutch is only slipping when you try to accelerate
As in you press the throttle, the engine revs rise but you don't go any faster
Then it does sound similar to symptoms I had
I put up with it for 6 months driving around it
Not that I'd recommend doing that. But it's not critically urgent. Unless you need to go up any hills
If it helps at all, these were the affected parts on my car
Here you can see the clutch plate shiny with oil, and the inside of the bell housing coated with oil

Failed crank main rear seal, on the engine behind the flywheel. It's not supposed to be oily there

And this is the failed gearbox input shaft bearing. The ball bearings are supposed to be held in a plastic cage, but if the gearbox oil level is low it overheats, the plastic melts and then the input shaft wobbles about letting gear oil into the bell housing. And you can hear the bearing rattling when you're in neutral

Fingers crossed yours is less problematic.
Parts are cheap but it does take a long time
Sorry I don't know when dual mass flywheels (DMF) came in, if yours has one that could add quite a bit to the cost