Taxonomy query, showing all posts. I want show just 1 (latest)

Hi, I have a page that is querying a custom taxonomy, “magazine”.

The code below lists ALL my taxonomies, in the correct order, but I want to just show ONE, even though I have it set to showposts = 1, it shows all. What am I doing wrong?

<?php
    $tax = 'magazine';
    $tax_args = array(
      'orderby' => 'ID',
      'order' => 'DESC',
      ''
    );
    $magazines = get_terms( $tax, $tax_args );
    foreach($magazines as $magazine) {
      $editions = new WP_Query(array(
        'post_per_page'=>1,
        'taxonomy'=>'magazine',
        'term' => $magazine->slug
      ));
      $link = get_term_link(intval($magazine->term_id),'magazine');
      $image_url = get_template_directory_uri();
      $magazineimage = wp_get_attachment_image_src(get_field('magazine_taxonomy_image', $magazine->taxonomy.'_'.$magazine->term_id), 'full');
      echo "<div class='news-item-wrapper'>";
        echo "<div class='news-item'>";
          echo '<div class="post-image" style="background-image:url('.$magazineimage[0].');">';
            echo "<a href=\"{$link}\" title='{$magazine->name}'>";
              echo '<img src="'.$image_url.'/dist/images/blank-image-magazine.gif" alt="'.$magazine->name.'" class="placeholder" />';
            echo "</a>";
          echo "</div>";
          echo "<header>";
            echo "<h2 class='entry-title'><a href=\"{$link}\" title='{$magazine->name}'>{$magazine->name}</a></h2>";
          echo "</header>";
        echo "</div>";
      echo "</div>";
    }
    ?>