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All answers having "Wither" as clue:

3 Character Answers:

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DIE



4 Character Answers:

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FADE

SEAR

SERE

WILT



5 Character Answers:

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BLAST

DRYUP



6 Character Answers:

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SCATHE



7 Character Answers:

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ATROPHY

SHRIVEL



9 Character Answers:

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SHRIVELUP