I had to do a brake job on my car today due to abnormal, uneven pad wear. (I discovered I had a problem when the inboard pad wore down on one side to the point it strated grinding against the rotor.)

Upon getting everything put back together, the caliper feels loose, and the little spring clip that goes at the bottom isn't really all that tight.

Anybody have any ideas what's causing this, and what I can do to fix it?

 

Sounds like the outboard piston is seized and the inboard piston

is doing all the work. Remove caliper and see if that is the case
and what has caused that.