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All answers having "$ promise" as clue:

3 Character Answers:

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IOU

VOW



4 Character Answers:

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AVOW

BODE

HOPE

OATH

WORD



5 Character Answers:

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EXCON

NYLON

SWEAR

TROTH



6 Character Answers:

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ASSURE

AVOWAL

ENGAGE

LANDOF

PAROLE

PLEDGE

SWANKY



7 Character Answers:

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BETROTH

HITHOME



9 Character Answers:

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ASSURANCE

GUARANTEE



10 Character Answers:

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PINKYSWEAR



12 Character Answers:

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GIVEONESWORD