### Clue: Naughty child set fire to model, given permission by mistake (6,6)
### Answer: LITTLE TERROR 
 ### Explanation: Definition: Naughty child
 LIT(past tense of "light"/set fire to, as "the candle was lit") + T(the model of an early car manufactured by Ford Motors) + LET(given permission/allowed to) **plus**(by) ERROR(a mistake).