'Clear a video url field at index specified by `index`.'

def clear_field(self, index):

    self.q(css=CLASS_SELECTORS['url_inputs']).nth((index - 1)).fill('')
    self.browser.execute_script("$('{}:eq({})').trigger('{}')".format(CLASS_SELECTORS['url_inputs'], index, 'input'))
    time.sleep(DELAY)
    self.wait_for_ajax()
