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All answers having "Become less intense" as clue:

3 Character Answers:

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EBB



4 Character Answers:

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EASE



5 Character Answers:

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ABATE

THROB



6 Character Answers:

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EASEUP

EFFIGY



7 Character Answers:

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EASEOFF

EDIFICE

SUBSIDE



11 Character Answers:

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IMPROVEMENT