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All answers having "Guards" as clue:

5 Character Answers:

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KEEPS

MINDS

TENDS



7 Character Answers:

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GATEMEN

PATROLS

SECURES

SHIELDS

WARDERS



8 Character Answers:

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PROTECTS

SECURITY

SENTRIES

SHELTERS

WATCHMEN



9 Character Answers:

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SENTINELS



10 Character Answers:

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COLDSTREAM