Possible Clues:

• Soft drink brand introduced in 1924
• Soda with fruity flavors
• Radar's favorite soda
• Royal Crown product
• Company named for the exaggerated height of its tallish bottles
• Soft drink brand since 1924
• Former name of the Royal Crown Company
• Drink whose name is a homophone of 48-Across
• Old pop brand
• Orange, peach or strawberry product