Possible Clues:

• With 41-Down, composition of a trail followed by [circled letters]
• Maker of Cups and Pieces
• Big name in cups
• Pieces seen in ''E.T.''
• Mars competitor
• Puffs cereal brand
• ___ Cup (snack item)
• Brand of Pieces and Puffs
• ___ FastBreak (Hershey product)
• Alternative to Mars