### Clue: Emperor has trouble with king on north-south road (6)
### Answer: MIKADO 
 ### Explanation: Definition: Emperor
 [ ADO(trouble;fuss) **placed after**(with, an in across clue) K(abbrev. for "king", as in chess notation) ]**placed after**(on, in an across clue) MI(M1, the English motorway that runs north-south, with the Roman numeral substitution).
Defn: … of Japan.