The term 'Classic Opener' can be summarized by the crossword solution NEO, which is a three letter word. NEO is an abbreviation for the phrase 'new opening', which is often used to describe a new beginning or a fresh start. It is also used to refer to a classic movie or book that has been recently released or re-released. NEO is often associated with the idea of a timeless classic, as it implies that something is both new and old at the same time.