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All answers having "Police officer" as clue:

3 Character Answers:

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COP



5 Character Answers:

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CITER



6 Character Answers:

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COPPER

LAWMAN

NABBER

ROZZER



7 Character Answers:

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TREMBLE

TROOPER

TRUMPET



8 Character Answers:

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ARRESTER

ARRESTOR

SERGEANT



9 Character Answers:

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CONSTABLE

INSPECTOR



12 Character Answers:

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UPANDRUNNING