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All answers having "Monarch" as clue:

3 Character Answers:

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REY

ROI



4 Character Answers:

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CZAR

KING

SHAH

TSAR



5 Character Answers:

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QUEEN

RAJAH

RECAP

RULER



6 Character Answers:

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DYNAST

PRINCE

STAYED



7 Character Answers:

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BLOUSON

EMPEROR

JANUARY



9 Character Answers:

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BUTTERFLY

POTENTATE

SOVEREIGN



13 Character Answers:

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INLANDREVENUE