It Could Be: The leak is coming from the clutch line.
OR
It Could Be: Thats it's the slave cylinder in the bell housing that is BAD! You will need to drop the tranny and change it. But if I were you, since you will have to drop the tranny to fix the slave cylinder, go ahead and change the clutch. Get your driveshaft rebuilt and have your flywheel turned.....You can buy the LUK (factory replacement) Clutch Kit from Pep Boys for around 200UDS. The slave cylinder is around 100USD. The rebuilt of the u-joints and balanced driveshaft around 60USD, then the flywheel should be around 30USD to get turned at a machine shop (don't let take too much off of it, or you will have to use shims or get another flywheel).
I know it seems like a lot of money and it is, but like I said since you have the tranny down, go ahead and do some preventive maintenance. Also would be a good time to replace the rear main seal!!! Good Luck!