### Clue: Hat for South American tailless marsupial after dark (8)
### Answer: SOMBRERO 
 ### Explanation: Definition: Hat for South American
 "roo"(short for "kangaroo", the Australian marsupial) **placed below**(after, in a down clue) SOMBRE(dark;gloomy). Another good misdirection, as South America has its share of marsupials.