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All answers having "Slow (down)" as clue:

3 Character Answers:

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BOG



4 Character Answers:

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EASE

EASY

WHOA



5 Character Answers:

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ABATE

BRAKE



6 Character Answers:

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ARREST

IMPEDE

REININ

RETARD



7 Character Answers:

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EASEOFF

SLACKEN



9 Character Answers:

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NOTSOFAST



10 Character Answers:

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DECELERATE

EASYDOESIT

ONEATATIME



15 Character Answers:

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HASTEMAKESWASTE