### Clue: King in line? Yes in Paris followed by son (5)
### Answer: LOUIS 
 ### Explanation: Definition: King
 L(abbrev. for "line") + OUI("yes" in the local lingo in Paris) **placed below**(followed by, in a down clue) S(abbrev. for "son").
Nice surface, as there have been King Louises of France, succeeded by their sons, in some cases, named King Louis themselves.