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All answers having "Guarantee" as clue:

3 Character Answers:

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ICE



4 Character Answers:

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AVOW

SEAL

ZING



5 Character Answers:

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REIGN

VOUCH



6 Character Answers:

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ASSURE

AVOUCH

ENSURE

INSURE

LOCKIN

PLEDGE

SURETY



7 Character Answers:

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ASSURES

CERTIFY

SUREBET

SWEARTO

WARRANT



8 Character Answers:

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ACRIMONY

MAKESURE

VOUCHFOR

WARRANTY



9 Character Answers:

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ASSURANCE