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All answers having "Destroyed" as clue:

4 Character Answers:

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DEFT

ERGO

SLEW



5 Character Answers:

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ASKED

RAZED

REIGN

SLAIN

SMOTE

UNDID



6 Character Answers:

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BRIEFS

DASHED

ERODED

INRUIN

RUINED

TOREUP

UNDONE

UNMADE



7 Character Answers:

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BLASTED

INRUINS

SPOILED

TRASHED

WRECKED



8 Character Answers:

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INPIECES

TOREDOWN



11 Character Answers:

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ANNIHILATED