The term 'Piece of a Pie' can refer to two different crossword solutions: 'CRUST' (5 letters) and 'Pizzaslice' (10 letters). The term 'CRUST' is used to describe the outer layer of a pie, which is usually made from flour, butter, and other ingredients. 'Pizzaslice' is a term used to describe a single slice of pizza, which is typically made with a flatbread CRUST, tomato sauce, cheese, and other toppings. Both of these terms are related to the term 'Piece of a Pie, ' as they both refer to a portion of a larger pie or pizza.