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All answers having "Apprehend" as clue:

3 Character Answers:

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BAG

COP

GET

NAB

SEE



4 Character Answers:

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CUFF

NAIL

TAKE



5 Character Answers:

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CATCH

SEIZE



6 Character Answers:

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ARREST

COLLAR

DETAIN



7 Character Answers:

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CAPTURE

REALIZE