First off - your Kimber does not have a clip. It has a magazine. Only M1 Garands and similar rifles use clips.
Secondly - small of back is not an ideal place to carry. If you get knocked down (which is possible in many mugging scenarios) before you get your firearm out - then you risk severe spinal injury or paralysis if that gun (or other hard object like a magazine carrier or cuff case) is over your spine when you impact. I strongly recommend adjusting your carry position to somewhere between 3-4 o'clock. (I personally carry at 3:30.)
With that said - Crossbreed holsters do get good reviews, though I've not tried them myself.