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All answers having "It has its ups and downs" as clue:

3 Character Answers:

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DOW



4 Character Answers:

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YOYO



5 Character Answers:

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GRAPH



6 Character Answers:

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SEESAW

THEDOW



7 Character Answers:

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HEMLINE



8 Character Answers:

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ELEVATOR



9 Character Answers:

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POGOSTICK



11 Character Answers:

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ELEVATORCAR



13 Character Answers:

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ROLLERCOASTER



14 Character Answers:

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MOUNTAINEERING