The last 'part' of each answer is the first 'part' of the next. Ex: Birthday Boy - Boy Wonder.
-1. A city district, generally characterized as the business centre. 8 letters,
d------n
-2. Administrative office of a municipal government. 4,4
-3. Corridor. 7
-4. Exit. 3,3
-5. External. 7
6. Where the substitutes are. singular. 8 or 4,4 side l---
-7. Ballistic path. 3, 4,2,4
-8. An alcoholic drink. 9 firew---r
-9. A major drop in a river bed. 9
10. Collapse. 4,4 fall d---