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All answers having "Started" as clue:

3 Character Answers:

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LED



4 Character Answers:

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AWAR

TEED



5 Character Answers:

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AFOOT

AROSE

BEGAN

BEGUN

SETIN

SHIED



6 Character Answers:

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BOOTED

CAMEON

LEDOFF

OPENED



7 Character Answers:

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FOUNDED



8 Character Answers:

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STRUCKUP



9 Character Answers:

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COMMENCED

INITIATED

POWEREDUP



10 Character Answers:

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EMBARKEDON

FIRSTBEGAN