AC clutch noise

[TEX TERRY, II]

AC clutch is making noise, a minute or so, after being engaged.  Noise gets
louder if the engine rpms are increased.  Checked low pressure, and high
pressure, and both are within range, according to my friend.  Belt is
correct tension.  When belt is not on pulley, pulley turns freely by hand.
Any suggestions?  Friend says possibly time to change clutch.

Tex Terry, II
83 5kt sedan
Franklin, PA USA