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All answers having "Guardian ___" as clue:

5 Character Answers:

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ANGEL

ARGUS



6 Character Answers:

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KEEPER

PATRON

WARDEN



7 Character Answers:

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TUTELAR



8 Character Answers:

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DEFENDER

SENTINEL

TUTELARY

WATCHDOG



9 Character Answers:

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CARETAKER

CUSTODIAN

PROTECTOR