Squealing on mine was due to the V's on the belt being worn which would also account for the belt being thrown off. The clutch is an ON/OFF device, not sure that it's likely to squeal.
No the pully doesn't move, just the clutch plate when the actuator coil is magnetised. The gap is minimal between the drive plate and the clutch plate but I don't have a measurement. Shims can be added to reduce the gap to compensate for wear. **** Part belts are NBG
Or possibly the adjustment tensioner bearing.The squealing could just be a worn/cracked belt and or adjustment needed. Take off the belt and spin the pulley by hand, check for too much float and go from there. The stress form the compressor is enormous on these earlier systems and the belt will suffer. Hopefully it's not thing serious and you can sort easily.
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