Clues are popular tourist attractions, landmarks or destinations. N = north S = south
No. 10. sounds like a impish detached islet (N8/6)
No. 11. City street boom and mizzen ( cockney slang) (N. 7/4/4)
No. 3. Colossal focal point in attic (N. 7/6) (in attic is in italics)