Add shortcode support to custom field output

custom-field-shortcode.php

<?php
/**
 * Apply shortcodes to custom field output
 * 
 * @author Joshua David Nelson, [email protected]
 */
 
$custom_field_output = 'some text with a [shortcode]';
add_filter( 'custom_field', 'do_shortcode' );
$custom_field_output = apply_filters( 'custom_field', $custom_field_output );
echo '<div class="custom-field">' . wpautop( $custom_field_output ) . '</div>';