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This site is a bit old now (not sure if it's kept up to date) but I found it helpful when I first started playing with Clojure several years ago (wow...that long already)?

http://java.ociweb.com/mark/clojure/article.html

Programming Clojure by Stuart Halloway is the clearest introduction to Clojure I've read: http://www.amazon.com/Programming-Clojure-Stuart-Halloway/

pg's "ANSI Common Lisp" and "On Lisp" are both great. Your question was about Clojure, but the material in those books is easily transferable to other lisp dialects.