...Now there are no cables under the clamp and the clamp is still installed so the bare wire is under the head of the screw and between the screw head and the clamp.

Why the heck would you leave an unused clamp in the box anyway? Not only would it prevent the screw from being firmly tightened on the ground wire and is a violation of 250.148(A) but it counts as a conductor in calculating box fill.

Dunno, but whenever I see unused clamps still in place it screems DIY!

-Hal