def clean_tag(tag):
    """
    Removes unwanted elements from a tag.
    :param tag: a bs4.element.Tag object containg an infobox that should be clean
    :return: cleaned_tag: a bs4.element.Tag object that has had nuisance elements removed
    """
    cleaned_tag = tag
    for sup in cleaned_tag('sup'):
        sup.decompose()

    return cleaned_tag