17 across
Republican
in
charge
producing
offensive
poster
(5)
Republican in charge producing offensive poster (5)
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The definition is at the end of the clue.
How the clue works
Look at offensive poster — that's your definition, the kind of troll who stirs up trouble online. Republican gives you R, and in charge gives you TOLL (as in a charge you pay), then you tuck R inside TOLL to get TROLL.