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All answers having "Tyrannical" as clue:

4 Character Answers:

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DOSE



5 Character Answers:

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HARSH



7 Character Answers:

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CZARIST



8 Character Answers:

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DESPOTIC

LISTLESS



10 Character Answers:

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AUTOCRATIC

DISCONTENT

IRONFISTED



11 Character Answers:

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DICTATORIAL



12 Character Answers:

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TOTALITARIAN