2000 4runner 5 speed clutch slipping?

I've had my 4runner for about 2 years it has about 60000 miles on it. Recently it has started to over rev in 2,3,4 gear while under acceleration. Does this sound like the clutch is starting to slip. Has anyone else had this problem? What did you do to fix it? Any input would be appreciated.
Thanks

If it slips under accelration, the answer is YES. No, I do not own a 2000, and when you replace the clutch. Do not forget to replace the pilot bearing and resurface the Flywheel. Another thing to do, is to rebuild or replace the hydraulic slave cylender. kind of been there, done that, and fogot to do that?

Also flush the line and replace all the fluid.

A 2000 standard transmission 4Runner - now there's a real rarity, at least in the States.

I wish I could have bought one. I have never even seen one.