Possible Clues:

• Wise guys from Chicago head to Washington for a fair amount of rounds in bewitching bars
• 'Presto!' sticks
• "Presto!" sticks
• They're waved at Hogwarts
• Parts of disappearing acts, sometimes
• They are used by those who make waves? Spells worry initially as well as ultimate troubles!
• Sticks with wave power
• They're waved