This project isn't supported for general use. (I use it to install the plugin locally, & I don't push anything to Clojars.) A better choice for a lein vimclojure plugin is lein-tarsier, which is actively developed & supported.
Leiningen plugin for launching a Vimclojure nailgun server. The version number of lein-vimclojure corresponds to the version of Vimclojure it launches.
If on lein 2, add
[org.clojars.pjt/vimclojure "2.3.1"]
to your :plugins list in your :user profile in ~/.lein/profiles.clj.
If on lein 1, run
lein plugin install org.clojars.pjt/vimclojure "2.3.1"
To start the server, call
lein vimclojure &
within your project's directory.