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All answers having "Compel" as clue:

3 Character Answers:

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FCE



4 Character Answers:

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GOAD

MAKE

URGE



5 Character Answers:

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DRIVE

FORCE

PRESS



6 Character Answers:

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COERCE

OBLIGE



7 Character Answers:

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ENFORCE



8 Character Answers:

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OBLIGATE



11 Character Answers:

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NECESSITATE



15 Character Answers:

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PUTTHESQUEEZEON