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All answers having "Lessened" as clue:

4 Character Answers:

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SANK



5 Character Answers:

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BATED

EASED

EBBED

PARED

WANED



6 Character Answers:

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ABATED

DIMMED



7 Character Answers:

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ALLAYED

ATEINTO

EASEDUP

REDUCED



9 Character Answers:

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DECREASED