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All answers having "Ruler" as clue:

3 Character Answers:

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ROI



4 Character Answers:

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AMIR

CSAR

CZAR

DEEM

EMIR

HEAD

KING

LORD

QUIP

SHAH

TOOL

TSAR

TZAR



5 Character Answers:

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AMEER

PLUMP

QUEEN



6 Character Answers:

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ANSWER

CAESAR

DYNAST

FERULE

GERENT

KAISER

LEADER

REGENT

SULTAN



7 Character Answers:

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EMPEROR

EMPRESS

MEASURE

MONARCH

PHARAOH

TOPARCH

TSARINA



8 Character Answers:

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AUTOCRAT

GOVERNOR

MAYFLIES

OVERLORD



9 Character Answers:

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ELIZABETH

POTENTATE

SOVEREIGN



11 Character Answers:

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HEADOFSTATE



12 Character Answers:

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STRAIGHTEDGE



15 Character Answers:

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EMPERORCONCERTO

PERSONINCOMMAND