Turn a StringBuilder into Clojure function

gistfile1.txt

user=> (def buffer (StringBuilder.))                                                                                
#'user/buffer
user=> 
(defn appender [^StringBuilder buffer]
  (fn [& args]
    (when-let [arg (first args)]
      (.append buffer arg)
      (recur (rest args)))))
user=> #'user/appender
user=> 
user=> (apply (appender buffer) (interpose " " [(java.util.Date.) (System/currentTimeMillis) :more :stuff "here"]))
nil
user=> (str buffer)
"Wed Feb 01 23:22:10 EST 2012 1328156530916 :more :stuff here"