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All answers having "Policeman" as clue:

3 Character Answers:

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COP

SEA



4 Character Answers:

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CTOR



5 Character Answers:

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BOBBY

CITER

FLOUR



6 Character Answers:

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COPPER



7 Character Answers:

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INHUMAN

JOHNLAW

OFFICER



8 Character Answers:

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ARRESTER

FLATFOOT



9 Character Answers:

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CONSTABLE



13 Character Answers:

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INCONSIDERATE