<ul>
<?php
$recent_posts = wp_get_recent_posts(array('post_type'=>'news'));
foreach( $recent_posts as $recent )
{
echo '<li><a href="' . get_permalink($recent["ID"]) . '" title="Look '.esc_attr($recent["post_title"]).'" >' . $recent["post_title"].'</a> </li> ';
echo '<p>' . get_field("news_source",$recent["ID"]) . '</p>';
}
?>
</ul>
It looks your are passing get field parameters incorrectly. I assumed “news_source” is your custom field name in acf.