What type of field is “club_membership_profile”?
Your code looks correct, for the most part, except if (isset($cluburl)) {. This will always be true and should be if ($cluburl) {. Other than this it depends on the field type. What your doing would work for a URL field.
This may also be incorrect if( $args->theme_location == 'Primary Menu' ){. I think you need to test against the menu name, like “menu-1” rather than the menu label.
