Hi,
Seems like this was fine when A/C was not in use so the bearing for the clutch is probably ok but the compressor which is just dead weight when not in use probably does have a problem that broke the belt.
For the moment - just unplug the compressor and install a new belt. Check all other pulley bearings while belt is off. If it runs quiet again with compressor unplugged it's ok to use without A/C for now. If the compressor had crunched, burned out etc., this will be an expensive job now to repair. Debris is probably thru the whole system and will need many parts replaced to have working A/C again.
When noise is heard when a compressor is running - FOLKS unplug them! They can still kick on when other settings are requested - usually most will work when defrost/defog is selected. When the crash it's a mess that could have been avoided. It's called the "Black Death" !!
That few extra minutes of A/C just cost a couple grand - EXTRA! Makes gasoline look free!
Make sure when the belt broke off it didn't wreck anything else while falling off.
I wasn't there but it sure sounds like the compressor itself seized up with lack of lubrication which happens over hard use, time, miles, AND use with low refrigerant which when low fails to carry oil with it to compressor,
T
Tom Greenleaf - MetroWest Boston - USA
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http://www.autoacsystems.com/tomgreenleaf/