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All answers having "Waves" as clue:

3 Character Answers:

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SWS



4 Character Answers:

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OLAS

SEAS

SURF



5 Character Answers:

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RADIO



6 Character Answers:

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SWELLS



7 Character Answers:

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BILLOWS

RIPPLES

ROLLERS



8 Character Answers:

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BREAKERS



9 Character Answers:

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WHITECAPS



14 Character Answers:

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NAVALPERSONNEL

OCEANMOVEMENTS



15 Character Answers:

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GOODBYEGESTURES