Hi Kurt,

Install cl-csv, then from a SLIME or SLY REPL you can call

--8<---------------cut here---------------start------------->8---
(asdf:load-system :cl-csv)
--8<---------------cut here---------------end--------------->8---

Try also the comma-commands.

If you install a Guix package after starting your REPL, you can refresh
ASDF paths with

--8<---------------cut here---------------start------------->8---
(asdf:clear-configuration)
--8<---------------cut here---------------end--------------->8---

Hope that helps!

-- 
Pierre Neidhardt
https://ambrevar.xyz/