The clues vary in degrees of difficulty. Here are some others from the same quiz. I only believe these answers to be correct and welcome any suggestions otherwise.
6. Add "er" to make a tasty snack. (7) Hamburg
12. Add a middle e for a solitary academic. (6)London
14. Administrative area for a churc? (5) Paris
16. A guided bus? Ours or yours? (5) Tours
20. Plus "e" for a lie down. (8) Adelaide
22. Spoil your chest rub medication? (9) Reykjavic
35. Needs final O for male dilletante. (4) Rome
39. Wage aggression.... with some teeth? (6) Warsaw