[edit: yeah lein is doing the load for me, but you can still just use load if you like. To run as a script Clojure uses 'java -cp ....', so your files need to be on your classpath location. It's been a long time, since I bothered with that way.]
> Can I use all its declarations as just find and not arc.find?
Yup (well, find is actually taken by clojure core, so you need to exclude it if you wanted your own version, but for everything else, which I believe was the intent of your question, you're golden).