Clutch Master Cylinder question. 1989 Supra.

[PFlanagan]

1989 Mk III non-turbo Toyota Supra. 180,000 miles.

The cylinder is leaking a lot of fluid, the clutch started to make grinding sounds, and it wouldn't start with the clutch pushed in; the car rolled forward. Somebody told me it was the clutch, but when I pumped the cylinder, the car moves forward and can do burnouts, and can be driven. When you start the car and try to put it in gear, it grinds, until you pump the clutch pedal.

Can anyone help me out, or give me some advice? Thanks in advance.