If you have a hydraulic clutch mechanism (I'm not familiar with your year/model) there are three parts that can leak.
1. Clutch Master Cylinder.
2. Clutch Slave Cylinder.
3. Flexable Hydraulic Line.
With the age of your Jeep I would suggest that it is time to replace all three components. Just think how many times that clutch pedel has been pushed in in the cars lifetime = millions.
The components are easy to install and the bleading procedure is easy too. If you have access to a cylinder hone you can re-build these components yourself if the inside bore is not pitted.
Both new, and remanufactured cylinders and cylinder seal kits are availible at local parts stores
You can also replace just the component that is leaking.
To check the master cylinder remove it and you will see the fluid leaking around the bore.
Follow the hydraulic line from the master cylinder down to the clutch bell housing and you will find the flexable line and the slave cylinder.
Check for leaks in the line and pull the rubber boot back from the slave cylinder to see if the cylinder is leaking.
The rubber boot will probbly be all wet and gummy and full of fluid if the slave cylinder is leaking. The boot may even be missing, rotted off from time.