How can I run a .clj Clojure file I created?

FWIW, I'm interpreting the question here as specifically asking how to run a single file, like a script, versus as a part of a compiled project. Obviously though, there's a relationship between how and why you would want to run a single file, and how you would want to build a full project, so I weigh that in some as well. Best choice: the clj tooling Docs are here: https://clojure.org/guides/deps_