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All answers having "Sack" as clue:

3 Character Answers:

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AXE

BAG

BED

CAN

RHO

ROB

SAD



4 Character Answers:

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BOOT

FIRE

LOOT

RACE



5 Character Answers:

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LETGO

POUCH



6 Character Answers:

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RAVAGE



7 Character Answers:

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DESPOIL

DISMISS

HEAVEHO

PILLAGE

PLUNDER



8 Character Answers:

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TAILBACK