Possible Clues:

• ___ Xtra (Coca-Cola Company beverage)
• Mr. -- (soft drink name)
• Mr. -- (soft drink)
• Mr. of soft drinks
• ___ Xtra (cherry drink)
• ___ Xtra (Dr Pepper alternative)
• Soft drink that used to be a Mr.
• Soft drink ___ Xtra
• ___ Xtra (soft drink brand)
• ___ Xtra (Dr Pepper rival)