Belt sqeals as if clutch is stuck. After engine is revved sqeal stops and A/c works properly.
Belt is tight.

The AC Pump or clutch may be starting to fail. You can also check for any bent pulleys.

The belt may simply need replacing.

I was afarid of that. Thank for reiforcing my thoughts. Belt did fray once and was replaced.
The AC Pump or clutch may be starting to fail. You can also check for any bent pulleys.