HI.
Here is your solution.
I did following changes to your code
1). Add reference to jquery library.
2). Save a reference chart class
var c1=new TradingView.chart(tradingview_embed_options);
3). Call render method
c1.render();
4). Remove extra link using jquery
$("div.tradingview-widget a").remove();
Changed code is as under.
$(document).ready(function()
{
var tradingview_embed_options = {};
tradingview_embed_options.width = 640;
tradingview_embed_options.height = 400;
tradingview_embed_options.chart = 'vkcQRj1Z';
var c1=new TradingView.chart(tradingview_embed_options);
c1.render();
$("div.tradingview-widget a").remove(); });
Below is Jsfiddle link
https://jsfiddle.net/0tnm1bar/1/[
^]