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All answers having "Watch over" as clue:

4 Character Answers:

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KEEP

MIND

REAR

TEND



5 Character Answers:

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GUARD

NURSE

RESEE

SEETO



6 Character Answers:

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ATTEND

POLICE



7 Character Answers:

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CAREFOR

PROTECT



8 Character Answers:

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CHAPERON



9 Character Answers:

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LOOKAFTER