Contact Form 7 WordPress plugin have Submit button in Generate tag drop down, and it goes easy. But it don’t have Reset, or Clear button. Here is easy solution how you can add it in your form.
In left side, where the form code is, just add this code at place where you need it:
[codesyntax lang=”html4strict”]
<input type="reset" value="Clear Fields" />
[/codesyntax]
You can see on this image, example of that