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All answers having "Hack" as clue:

3 Character Answers:

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AXE

CAB

HEW

LOP



4 Character Answers:

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CHOP

LIFE

TAXI



5 Character Answers:

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CABBY

COUGH

SLASH



6 Character Answers:

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CABBIE

CABMAN

DRIVER

HAGGLE

JOURNO



7 Character Answers:

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TAXICAB



8 Character Answers:

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DRYCOUGH

QUICKJOB



9 Character Answers:

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CABDRIVER



10 Character Answers:

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JOURNALIST

TAXIDRIVER

WARDHEELER



15 Character Answers:

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POLITICALYESMAN

SOFTWAREBREAKIN

THIRDRATEWRITER