How can I override a broken Haskell package in nix?

I use NixOS, and I'm trying to set up a Nix Haskell environment for my Haskell project. I have [this Haskell package](https://github.com/open-editions/open-editions.org/blob/master/open-editions.nix) written in Nix that I'm trying to get working via nix-shell, but the dependent Haskell package Clay [won't build, as described in this bug report I just opened](https://github.com/NixOS/nixpkgs/issues/54958) . How can I override this package with a different (older or newer, I guess it doesn't matter) version of this Haskell package that works?