I am using Clojure & Slick2d for the Action RPG I am developing so I can say Clojure is a great choice for games!
I even open sourced my game: (with video) https://code.google.com/p/clojure-rpg/
You can play it here (older version , not so fun but works!) http://resatori.com/cyber-dungeon-quest-alpha-1