Why not use something like https://github.com/ruricolist/cloture (a Clojure "adapter" that runs on Common Lisp) if you want that?

That seems very abandoned.

How so? Last commit: June of this year. State: "very early (pre-alpha) stages, but it has progressed far enough to load clojure.test, allowing the test suite to actually be written in Clojure." and the author is still a very active lisper. So, pretty nice for an experiment, I guess.

Yes, that commit changed the readme. The commit before that was in January of 2021, the one before that in March 2020. Doesn't look very active to me.