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All answers having "Seized" as clue:

3 Character Answers:

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GOT



4 Character Answers:

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REFT

TAEN

TOOK



5 Character Answers:

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TAKEN



6 Character Answers:

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CAUGHT

NABBED

STRESS



7 Character Answers:

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GRABBED

LEAPTAT

USURPED



8 Character Answers:

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ARRESTED

CAPTURED

SNATCHED