And I think this simpler example would also work (replace the name of the custom field for featured in both examples):
$args = array (
'post_type' => 'nieuws',
'posts_per_page' => 1,
'orderby' => 'date',
'order' => 'DESC',
'meta_key' => 'custom_field_featured',
'meta_value' => 1,
'meta_compare' => '='
);
Veel succes 😉
