The term 'Wonderland Beverage' is a reference to the classic novel Alice's Adventures in Wonderland by Lewis Carroll. The crossword solution for this term is TEA, which is a popular beverage that has been enjoyed for centuries. TEA is made from the leaves of the Camellia sinensis plant and can be served hot or cold. It is often flavored with herbs, spices, and fruits, and is a popular drink around the world.