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All answers having "Improve" as clue:

3 Character Answers:

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AGE



4 Character Answers:

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EDIT

GAIN

HEAL

HELP

HONE

MEND

REDO

TEXT

VENT



5 Character Answers:

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AMEND

BOOST

COWER

EMEND

MOCHA

RALLY

RENEW

WIDEN



6 Character Answers:

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BETTER

CARESS

ENRICH

LOOKUP

REFINE

REFORM

RETOOL

SOUPUP

STALAG



7 Character Answers:

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ENHANCE

PAPOOSE

PRAIRIE

RECLINE

SHARPEN

SWEETEN

UPGRADE



8 Character Answers:

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DOBETTER



9 Character Answers:

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GETBETTER

MELIORATE

REDEVELOP



10 Character Answers:

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AMELIORATE