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All answers having "Police" as clue:

3 Character Answers:

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LAW



4 Character Answers:

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CARS

COPS

FUZZ

HEAT



5 Character Answers:

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BATON

FIVEO

FORCE



6 Character Answers:

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FINEST

PATROL

THEMAN



7 Character Answers:

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ACADEMY

OLDBILL



13 Character Answers:

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PEACEOFFICERS