Jesse Gibbons has recently added the "clojure" executable wrapper. This makes the Guix `clojure` behave similarly to the Debian `clojure`. Closing this issue.
(Note that this behaviour is still a little different to the bundle provided by the upstream Clojure project which include custom `clj` and `clojure` scripts from https://github.com/clojure/brew-install, which include auto-downloading of dependencies and such.)
