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All answers having "Oath" as clue:

3 Character Answers:

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VOW



4 Character Answers:

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CUSS



5 Character Answers:

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CURSE

SALSA

UNITS



6 Character Answers:

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AVOWAL

PLEDGE



7 Character Answers:

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PROMISE



8 Character Answers:

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CUSSWORD

THETOOTH



9 Character Answers:

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CURSEWORD

EXPLETIVE

SOLEMNVOW

SWEARWORD



11 Character Answers:

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FLETTERWORD



13 Character Answers:

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ANDNOTHINGBUT

THEWHOLETOOTH