I use clojure-mode and http://github.com/jochu/swank-clojure/. They work for local or remote Clojure repl, compile files, look up code, auto-complete, display args and docs help, etc. It's not as complete as CL. It doesn't have debugging because clojure's debugging info is in the JVM, so something like Enclojure/Netbeans has full debug support.