Possible Clues:

• Iced tea garnish
• Drink garnish
• Citrus garnish
• *Iced tea garnish
• Garnish for a glass of water, or a literal feature of 17-, 29-, 35- and 42-Across
• Doesn't land, as a joke
• Garnish for a vodka tonic
• Iced-tea garnish
• Golfer's favorite drink garnish?
• Bar garnish