The most common and most likely answer to this crossword clue is the 12 letter word AMBASSADRESS
I've seen this crossword clue in The Times
A
M
B
A
S
S
A
D
R
E
S
S
More clues leading to the result AMBASSADRESS
- Dope imported by nameless Chinese official, smooth agent
- Official voice possessed by a graduate with robe
- Male singer, one wearing a garment usually worn by female diplomat
- A male deep-toned with a robe suitable for diplomat
- A graduate’s short speech cut down by diplomat
- Agent’s daughter leaving home to pursue a male singer
Buddy explains!

The straight part
We know that "Official" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case official = ambassadress.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does AMBASSADRESS mean?
AMBASSADRESS noun- A female ambassador.
- The wife of an ambassador.