The most common and most likely answer to this crossword clue is the 9 letter word DEMAGOGUE
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The cryptic/wordplay part
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What does DEMAGOGUE mean?
DEMAGOGUE noun- A political orator or leader who gains favor by pandering to or exciting the passions and prejudices of the audience rather than by using rational argument.
- A leader of the people.
- To speak or act in the manner of a demagogue; to speak about (an issue) in the manner of a demagogue.