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All answers having "Improved" as clue:

4 Character Answers:

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AGED



5 Character Answers:

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HONED

TONED

WIDER



6 Character Answers:

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BETTER



7 Character Answers:

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AMENDED

EMENDED

RALLIED

REWIRED

SIMPLER

WIDENED



8 Character Answers:

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BETTERED

ELEVATED

ENHANCED

UPGRADED



9 Character Answers:

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GOTBETTER



10 Character Answers:

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SPECULATED



11 Character Answers:

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AMELIORATED