Possible Clues:

• Zest of Frenchman in Lyon told to strip
• Iced tea garnish
• Zest shown by someone disappointing PM once
• Fruit rind
• Bar garnish
• Bar zest
• E.g. Trotsky and ex-PM imprisoning spy chief could be a twist
• Source of zest
• *Iced tea garnish
• Bartender's twist