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All answers having "Oversee" as clue:

4 Character Answers:

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HEAD

SPUR

TEND



5 Character Answers:

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GUARD

STEER

WATCH



6 Character Answers:

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MANAGE

POLICE



8 Character Answers:

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REGULATE



9 Character Answers:

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SUPERVISE



10 Character Answers:

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RIDEHERDON



12 Character Answers:

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PERSPIRATION