The most common and most likely answer to this crossword clue is the 10 letter word COUNCILLOR
C
O
U
N
C
I
L
L
O
R
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 = councillor.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 COUNCILLOR mean?
COUNCILLOR noun- A member of a council.
- In particular, a representative elected to a local authority, such as a city council: a city councillor