### Clue: Vicious insult about King in command (8)
### Answer: BARBARIC 
 ### Explanation: Definition: Vicious
 BARB(insult) +A(abbrev. for "about"? – I presume this is an alternative to the Latin-based "c" or "ca". Or there's a typo?) + R(abbrev. for "Rex", Latin for "king") + I.C.(abbrev. for "in charge of";in command).