This project includes a language file for Clojure syntax highlighting in gedit. It is based on the official Clojure parser. The syntax definitions are taken from here.
Just put the clojure.lang file where gedit can find them.
On Fedora and CentOS, this is /usr/share/gtksourceview-3.0/language-specs/.
Then, open up a file in gedit with a .clj extension!
MIT. Also, don't use it for evil.
https://wiki.gnome.org/Projects/GtkSourceView
http://stackoverflow.com/questions/766775/creating-your-own-syntax-highlighting-in-gedit
https://github.com/mitko/clojure_for_gedit
http://stackoverflow.com/questions/21089486/configure-clojure-syntax-highlighting-for-gedit
def.lang for list of default styles