input & output

gistfile1.clj

;; input
[{:name "jay fields", :current-city "new york", :employer "drw.com"}
 {:name "john dydo", :current-city "new york", :employer "drw.com"}
 {:name "mike ward", :current-city "chicago", :employer "drw.com"}
 {:name "chris george", :current-city "new york", :employer "thoughtworks.com"}]

;; desired output
{"thoughtworks.com" ("chris george"), "drw.com" ("jay fields" "john dydo" "mike ward")}