(17A. Fountain treat), LEMON CREAM (27A. Tangy pie filler), APPLE CRUMBLE (37A. Relative of a certain cobbler), CHERRY MASH (51A. Candy bar with maraschinos) and ORANGE CRUSH (59A. Popular Fanta-like soda) are the interrelated entries of this clever and amusing Tuesday crossword. The fruit (banana, lemon, apple, cherry and orange) along