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All answers having "___ agent" as clue:

3 Character Answers:

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IRS

REP

RHO

SPY



4 Character Answers:

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DOER

GMAN



5 Character Answers:

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PRESS

PROXY



6 Character Answers:

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BROKER

FACTOR



7 Character Answers:

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OPERANT

PROCTOR



8 Character Answers:

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ASSIGNEE

DELEGATE

EMISSARY

OPERATOR



9 Character Answers:

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GOBETWEEN

MIDDLEMAN

NEGOTIANT

OPERATIVE



11 Character Answers:

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TYNEANDWEAR