### Clue: Have permit to go by plane, then lose it! (3,3)
### Answer: LET FLY 
 ### Explanation: Definition: lose it
 LET(to give permission to) + FLY(to go by plane). I'll have to ignore "have", as "to let" is to "give", not "have", permission.
Defn: To lose one's cool/temper.