ml 320 ac clutch

[jeepman]

hello , my daughter goes back to school in 3 days and her ac has quit working . I have checked charge and its good , I have checked all fuses and they are good . I put a test light on the wire going to compressor and when I flip on the ac the light comes on and then goes out when I turn off ac indicating the clutch is getting power. Could the clutch just be bad and if so can it be changed with out a compressor swap . Is there anything else I should check ?