[Mulletwagon]

Might pull the clutch inspection cover and observe if the disk stops spinning when the pedai is depressed. In addition to what has already been said, could be a bad pilot bearing which is dragging the input shaft. When not moving suggest downshifting from second to neutral, wait momentarily with pedal still depressed and then ease into first. If still grinding the problem is the flywheel, pressure plate, or pilot bearing is causing the disk to rotate. Another possibility is the disk is hanging up on the input shat spline and leaving the disk in contact with the flywheel. Be sure and tell us the fix.