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All answers having "Not so fast!" as clue:

4 Character Answers:

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EASY

UHUH

WAIT

WHOA



5 Character Answers:

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PAGES



6 Character Answers:

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HANGON

HOLDIT

HOLDON

LOOSER

SLOWER

SLOWLY

SUPPER



7 Character Answers:

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ANDANTE

GRADUAL

SEEHERE



8 Character Answers:

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MISCHIEF

WAITASEC