### Clue: Yarn about humorous duck leaving zoo in a run-down area (8,4)
### Answer: TWILIGHT ZONE 
 ### Explanation: Definition: a run-down area
 TWINE(yarn;string) **containing**(about) [ LIGHT(humorous;opposite of "serious") + "O"(representing 0;nil;duck in cricket scoring) **deleted from**(leaving) "zoo" ].
Defn: … in a town or city.