This thread is resolved. Here is a description of the problem and solution.
Is it possible to translate the custom permalink from Settings -> Permalinks.
Unfortunately, it is not possible to translate the custom permalink that way that you have created it. But you can set up a custom post type and have that custom slug (/clunky/) in front of your posts. Then you would be able to translate it in WPML -> Post Type Translation.
This is the technical support forum for WPML - the multilingual WordPress plugin.