Clojure lacks a formal spec, commercial vendor support, and doesn't have the long track record of CL. Clojure also requires JVM issues to be considered (e.g., which JVM will you use?). Don't know about C FFI with Clojure, but perhaps that's another CL advantage?
For many, Clojure may be a better choice as you suggest: perhaps especially for web projects. But I think for some groups and applications, CL remains a better choice.