As someone with extensive experience in Java, but new to Clojure, The Joy of Clojure does a great job of laying the necessary foundation to start doing serious development in Clojure. As others have noted, you can learn the syntax of Clojure very quickly, but learning to develop in idiomatic Clojure is a much longer process. Fogus does a good job of explaining some fairly complicated concepts in a fashion that programmers with an object oriented background will be able to pick up.
I've definitely found myself having to reread sections here and there, but overall the pace does a good job of letting things sink in. You'll definitely do best if you fire up a REPL and play around while you read.
I've definitely seen enough of Clojure to want to use it for real projects. The trick is figuring out how to get the company and rest of the team comfortable enough to make the switch!