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All answers having "Run off" as clue:

3 Character Answers:

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RHO



4 Character Answers:

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BOLT

FLEE

FLOW

SHOO



5 Character Answers:

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DRAIN

ELOPE

ERODE

LEAVE

MIMEO

PRINT

REPEL

XEROX



6 Character Answers:

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ESCAPE



7 Character Answers:

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ABSCOND



9 Character Answers:

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SCAREAWAY

SKEDADDLE



10 Character Answers:

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TAKEFLIGHT



15 Character Answers:

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TAKETOONESHEELS