The most common and most likely answer to this crossword clue is the 13 letter word GERRYMANDERED
I've seen this crossword clue in The Daily Telegraph
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More clues leading to the result GERRYMANDERED
Buddy explains!
The straight part
We know that "manipulated politically" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case manipulated politically = gerrymandered.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 GERRYMANDERED mean?
GERRYMANDERED verb- To divide a geographic area into voting districts in such a way as to give an unfair advantage to one party in an election.
- (by extension) To draw dividing lines for other types of districts in an unintuitive way to favor a particular group or for other perceived gain.