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All answers having "Pillage" as clue:

3 Character Answers:

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ROB



4 Character Answers:

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LOOT

SACK



5 Character Answers:

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BOOTY

FORAY

HARRY

RIFLE

TALLY



6 Character Answers:

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MARAUD

RAPINE

RAVAGE

THIEVE



7 Character Answers:

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DESPOIL

RANSACK

REENACT



8 Character Answers:

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SPOLIATE



9 Character Answers:

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DEPREDATE



11 Character Answers:

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DEPREDATION