Clojure is often billed as "just another JAR" and in my experience I've never felt the need to install via any package manager. My workflow often consists of a new leiningen project where I define the version of Clojure that I want to use for the current project, along with whatever I else I need for the task at hand. Likewise, if I just need a quick repl to test something out, I'll simply use `lein repl` and fire away.