If I run speedbar and call (speedbar-add-supported-extension ".clj") in init.el, then I see my Clojure files in the speedbar, and I can expand them to show the function definitions inside, like this:
Running in emacs -Q I set up this file and added it to my agenda
#+TAGS: [ toptag : subtag ]
* headline 1 :toptag:
* headline 2 :subtag:
* headline 3
org-tag-alist now has value (("[") ("toptag") (:...