### Clue: Diplomatic official cheers up, overlooking facial feature (7)
### Answer: ATTACHE 
 ### Explanation: Definition: Diplomatic official
 **Reversal of**(up) TA(an expression of thanks!;cheers!) **placed above**(overlooking, in a down clue) TACHE(short for "moustache", a facial feature if you don't shave your upper lip).