In a clojure buffer `(:foo/def bar baz)` is highlighted much like `(def bar baz)` rather than taking the keyword font. I'm running: - GNU Emacs 24.5.1 (x86_64-pc-linux-gnu, GTK+ Version 3.16.6) of 2015-09-17 on lgw01-52, modified by Debian - clojure-mode (version 5.2.0) - Ubuntu 15.10