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All answers having "Start over" as clue:

4 Character Answers:

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ANEW

REDO



5 Character Answers:

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RENEW

RESET

RESOW



6 Character Answers:

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REOPEN

RERACK



11 Character Answers:

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OAONEEIGHTY



15 Character Answers:

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AKEITFROMTHETOP

URNOVERANEWLEAF