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All answers having "Go fast" as clue:

3 Character Answers:

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HIE

RIP



4 Character Answers:

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DASH

RACE

TEAR

ZOOM



5 Character Answers:

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SCOOT

SKIRR

SPEED



6 Character Answers:

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STREAK



8 Character Answers:

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MAKETIME



9 Character Answers:

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SHAKEALEG