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All answers having "Cops" as clue:

3 Character Answers:

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LAW



4 Character Answers:

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FUZZ

HEAT

NABS

POPO



5 Character Answers:

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FIVEO



6 Character Answers:

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FINEST

POLICE

SWIPES

THELAW



7 Character Answers:

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CHASERS

FILCHES



9 Character Answers:

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ARRESTERS