There is no lem package on NixOS.Common lisp related packages tend to be outdated NixOS violates FHS to allow each packages to build against specific versions of dependencies, so CL tools might not work as expected.
Common Lisp. It would take a long while before I'm comfortable working on a project using that language. There's also Lem editor but setting it up is a pain on NixOS.
How about docker/podman container?