There are some rankings at
http://www.socialpsychology.org/ranking.htm but I question if what you are looking for exists. The rankings I like are actually a research paper that you can find using PsychInfo. The paper is called "Research Productivity and Academic Lineage in Clinical Psychology:Who Is Training the Faculty to do Research" by Roy, Roberts, and Stewart. I think this is the best ranking out there (it is from 2006) but really rankings don't mean much in Clinical Psych (I think at least). All about fit and where you will be most productive and get the best training.