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All answers having "Nick" as clue:

3 Character Answers:

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MAR



4 Character Answers:

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CHIP

DENT

DING

DINT

JAIL



5 Character Answers:

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GRAZE

NOTCH

STEAL



6 Character Answers:

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ARREST

ENCORE

PILFER

POLICE



7 Character Answers:

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BRINGUP

PURLOIN



8 Character Answers:

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OUTRIGHT



13 Character Answers:

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POLICESTATION