Clojure code snippets don't have syntax highlighting

# Bug report

Clojure code snippets are missing syntax highlighting.

## OS information

## Steps to reproduce

1. Enable Clojure
2. Open a page with a code snippet

## More resources

Expected outcome: code snippets should have syntax highlighting.

## Possible fix

Add syntax highlighting or fix whatever prevents it from working with Clojure source code samples.

Start by reproducing the issue after enabling Clojure and opening a page with a code snippet. Trace how Clojure source samples are rendered and compare them with a highlighted language; done means Clojure snippets display syntax highlighting without affecting other snippets.

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