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All answers having "Agents" as clue:

4 Character Answers:

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FEDS

GMEN

REPS

TMEN



5 Character Answers:

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DOERS

SPIES



7 Character Answers:

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BROKERS

FACTORS

PROXIES



8 Character Answers:

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OPERANTS

PROCTORS



9 Character Answers:

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MIDDLEMEN



10 Character Answers:

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EMISSARIES

GOBETWEENS

OPERATIVES