wp_nav_menu, adding a div around the secondary ul

Use a custom walker class (a nice tutorial here: https://wpquicktips.wordpress.com/2010/07/09/create-a-custom-menu-by-creating-your-own-walker/) and change the output any way you like ??

Thank you so much for the tutorial, I’ll give it a try.

Really, really appreciate it. Cheers!

Just as a note for anyone who ends up with the same problem, here is the code I ended up using for the custom walker:

class Walker_Page_Custom extends Walker_Nav_Menu {

function start_lvl(&$output, $depth) {
    $indent = str_repeat("\t", $depth);
    $output .= "\n$indent<div class='flare'><ul>\n";
	}

function end_lvl(&$output, $depth) {
    $indent = str_repeat("\t", $depth);
    $output .= "$indent</ul></div><!--flare -->\n";
	}

}

Thanks again for the help