Old Lemon is a term used to describe an outdated or obsolete product. The term is often used to refer to cars, but can also be used to describe any product that has become outdated or obsolete. The crossword solution for Old Lemon is 'EDSEL', which was a car brand manufactured by Ford Motor Company from 1958 to 1960. The EDSEL was a commercial failure and is now considered an example of an outdated or obsolete product.