Has the fluid dissappeared from the clutch reservoir? If so, it must have gone someplace. Check if it's soaked into the padding under the carpeting below the pedal.

If the fluid is gone, you may get away with filling it & bleeding out the air. But that doesn't fix the leak.

It could also be something broken at the throw-out fork or the pressure plate. Check out the throw-out fork, whether it's moving properly.