You can modify or change position of category description. If you want to show it anywhere in archive page, you can do it by overriding listing archive template.
Source Folder and Files
wp-content/plugins/classified-listing/templates/archive-rtcl_listing.phpIf the file already overridden using theme, source file location will be – wp-content/themes/your-theme/classified-listing/archive-rtcl_listing.php
Destination Folder and Files:
wp-content/themes/child-theme/classified-listing/archive-rtcl_listing.phpFind below line of code and place it in your desire position –
<?php do_action('rtcl_archive_description'); ?>