<?php
        $currentID = get_the_ID();

        $args = array(
          'post_type'       => 'nieuws',
          'orderby'         => 'date',
          'post__not_in'    => array($currentID),
          'nieuwssoort'     => current$term->slug,
          'posts_per_page'  => '7',
          );

        $the_query = new WP_Query( $args );
      ?>

      <?php if ( have_posts() ) : while ( $the_query->have_posts() ) : $the_query->the_post(); ?>