There is no good word for "clipboard" in Polish, it could be "podkładka", "podkładka do pisania", "podkładka z klipsem". In computer, the clipboard (a place that you copy things to using Ctrl-C)...
No. Polish can be a verb, as in to polish a penny (clean or brighten a penny). Polish can be an adjective, as in "That man is Polish." Polish is used to describe people from Poland.