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All answers having "Get cracking" as clue:

3 Character Answers:

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HIE

RUN



4 Character Answers:

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ASAP

CHAP

DOIT



5 Character Answers:

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BEGIN

HATCH

HOPTO

HURRY

LAYTO

START



6 Character Answers:

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GOTOIT



7 Character Answers:

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SEETOIT