I would guess it is your slave clutch cylinder, if not, then it gets more expensive.
Does it have trouble shifting into all gears?? Is so, then I would bet on the slave cluth cylinder. I replaced mine about 2 months ago as I was having shifting woes.
Now there are two thoughts on the source to buy them from. Some say get it from the factory only. Factory comes with master, slave, hose. I got my slave cylinder from O'Rileys ('96 model). It cost around $44 and has a limited lifetime warranty. Other places wanted $100 just for the slave cylinder.
One bit of warning from the one from O'Rileys it does not come with the bleed hole all the way through into the cylinder, but does have the threaded area on the housing.
I ended up hooking up the hose to my new slave cylinder - refilled the master cylinder with fresh fluid and then began working the plunger on the slave cylinder. I refilled the master a few times and repeated the plunging until no air was visible in the master. Then I mounted the slave. There is a little plastic braw that holds the plunger for ease of installation - leave the braw in place as the little tabs will break off as soon as you push the clutch pedel in after mounting.
It is an easy replacement, just be sure to have a catch pan for the clutch fluid and a new can to refill the master. The hardest part is to remove the cross pin that retains the hydraulic hose.
BTW - if you have a leak in the hose or master, then you will need to buy the whole master, slave, hose from the dealer as it comes as a complete set. Don't remember the price.