### Clue: Capital of Laos: Louangphabang? (4)
### Answer: OSLO 
 ### Explanation: Definition: Capital
A hidden answer ('of') in 'La**OS LO**uangphabang'. Of course, OSLO is not the capital of Laos – nor is Louangphabang, although the latter is a city in that country; the capital is Vientiane