The most common and most likely answer to this crossword clue is the 8 letter word DEMOCRAT
I've seen this crossword clue in Financial Times
D
E
M
O
C
R
A
T
More clues leading to the result DEMOCRAT
- US politician caught deserter at end of rally
- Male in fancy red coat, US politician
- Eg Truman’s protest about Republican getting army backing
- Party type's contribution to star comedian's turn?
- . Protest singer hampering conservative US politician?
- Politician followed restraining order when upset
- Protest march about renegade politician?
- Party politician in protest against Conservative scoundrel
- Vexed expression when describing comeback for Clinton?
- Appear to backtrack during expression of annoyance with Obama?
Buddy explains!

The straight part
We know that "Politician" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case politician = democrat.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 DEMOCRAT mean?
DEMOCRAT noun- A supporter of democracy; an advocate of democratic politics (originally as opposed to the aristocrats in Revolutionary France).
- Someone who rules a representative democracy.
- A large light uncovered wagon with two or more seats.