Fluid is getting past a seal somewhere. Look under the rig at the slave cylinder. Is the boot wet/leaking/nasty? If it looks ok, look up under the dash at where the clutch pedal pushrod goes through the firewall. Is it wet there?
Most likely leakdown in the slave cylinder. DO NOT expect it to last long like this. Either replace it or rebuild it asap. If it's post-74(?), you should be able to get a rebuild kit with a new piston at your local auto parts store. Be sure to hone the cylinder as well since the most common cause of failure is a rusty bore that will continue to damage piston seals until it's cleaned up.