Shortcode from a widget is wrapped in unwanted element

There actually are several ways to handle the WordPress editor wrapping shortcodes in <p> tags.

This code shows probably the simplest way to do it…just a simple and short function you need to drop into your functions.php file. Once you do, no more tags around your shortcodes that are on their own line!

function wpex_clean_shortcodes($content){   
$array = array (
    '<p>[' => '[', 
    ']</p>' => ']', 
    ']<br />' => ']'
);
$content = strtr($content, $array);
return $content;
}
add_filter('the_content', 'wpex_clean_shortcodes');

Source: http://www.wpexplorer.com/snippet/clean-wordpress-shortcodes

Hope that helps someone!