Remove text on click

Hello, I have text areas in the product stage designer, it has placeholder text, I wanted to figure out how can I remove the placeholder text on single click instead of having to double click to select all then delete it manually.

I tried to do some coding but I am not very good with javascript, My issue is how to get the existing canvas element then edit it 

Currently I have something like this but I get error undefined stage 

stage.on("text:editing:entered", clearText);

function clearText(e) {
  if (e.target.type === "i-text") {
    if (e.target.text === "Tap and Type") {
      e.target.text = "";
      stage.renderAll();
    };
  }
}