Clutch pedal dont return back on your mk 3 vw golf 1.8?

1) Either your cable is frayed inside the cable sheath. (inexpensive, oil the new cable and sheath on replacement)

2)Or the clutch "push-rod" is wearing through the plate and in a short while will fail and need a new clutch. (expensive)

3)Or the little lever on the last housing has slipped on its splined shaft and you need a new one (inexpensive)