The crossword solution for the term 'Classy Entrance' is ARCH, which is a four-letter word. An ARCH is a curved structure that is used as an entrance or passageway. It is often seen in architecture and is commonly used to create a grand entrance. Arches are also used to support the weight of a structure, such as a bridge or a roof. The use of arches in architecture has been around since ancient times and is still popular today.