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All answers having "Improves" as clue:

4 Character Answers:

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AGES



5 Character Answers:

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EDITS

HEALS

HONES

MENDS

PAVES



6 Character Answers:

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AMENDS

BOOSTS

EMENDS



7 Character Answers:

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BETTERS

BUMPSUP



8 Character Answers:

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ADVANCES

ENHANCES



9 Character Answers:

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BRIGHTENS



10 Character Answers:

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GETSBETTER

MELIORATES



11 Character Answers:

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AMELIORATES