Slime + Clojure + Swank

Install clojure-mode: in emacs scratch buffer, input the following

(require 'package)
(add-to-list 'package-archives
             '("marmalade" . "http://marmalade-repo.org/packages/"))
             (package-initialize)
then             
    M-x eval-buffer
    M-x package-refresh-contents
    M-x package-install clojure-mode