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All answers having "Deteriorated" as clue:

4 Character Answers:

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WORE



6 Character Answers:

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ERODED

RUSTED

SOURED



8 Character Answers:

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CORRODED

GOTWORSE



9 Character Answers:

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GONETOPOT

RANTOSEED

WENTTOPOT



10 Character Answers:

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WENTTOSEED



11 Character Answers:

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RETROGRADED