Yes, I can see your point. And there are some really good innovations clojure has made I think - specifically the immutable data types are really beyond compare, anyone wishing to learn more about immutable data structs should definately read their source in clojure its clear and understandable.
Still, if anyone wants to learn what lisp is all about. I'd just recommend common lisp (clisp or sbcl) for getting the special forms, repl, and beauty of macros bits. It also means you don't have to know anything about java to get the key concepts of a lisp, which is less overhead overall.
Regardless of common lisp or clojure, I'd always recommend anyone listen to Rich Hickey's talks on clojure, they are very good, especially his talks about values, composition, and simplicity. (http://www.infoq.com/author/Rich-Hickey)