<iframe src="https://www.twitch.tv/embed/monstercat/chat" id="chat_frame" style="width: 800px; height: 400px;"></iframe>
<script type="text/javascript">
var parent = ['sites.google.com', 'www.gstatic.com', window.location.host];
console.log(parent);
document.getElementById('chat_frame').setAttribute('src', document.getElementById('chat_frame').getAttribute('src') + '?parent=' + parent.join('&parent='));
</script>
You’d just swap the src for the clip URL. And probably use a different ID on the iframe HTML