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All answers having "Run away!" as clue:

3 Character Answers:

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EEK



4 Character Answers:

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BOLT

FLEE

FLIT



5 Character Answers:

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ELOPE

HORSE

TREAT



6 Character Answers:

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DECAMP

ESCAPE

KNIGHT

SCURRY



7 Character Answers:

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ABSCOND

COLLECT

GARLAND



8 Character Answers:

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TURNTAIL



9 Character Answers:

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AMENITIES



10 Character Answers:

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HIGHTAILIT



11 Character Answers:

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TESTMATCHES



13 Character Answers:

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UNDERCARRIAGE



14 Character Answers:

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TAKEITONTHELAM