Just to clarify, are you pushing in the clutch while in gear, and after a moment or so the Jeep tries to move while the clutch is still disengaged?(pedal to the floor)
Do you hear any grinding or whirring noise while the clutch is disengaged?
Do you hear any noise when the clutch is engaged?
From your first description it sounds more like a master/slave cylinder problem. If its an internal slave, then the throwout bearing is incorporated.