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All answers having "Fee" as clue:

3 Character Answers:

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FIE

FUM



4 Character Answers:

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COST

DUES

OGRE

RATE

TOLL

USER

WAGE



5 Character Answers:

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OGRES

PRICE

USERS



6 Character Answers:

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CHARGE



7 Character Answers:

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PAYMENT

SETRATE

STIPEND

TUITION



8 Character Answers:

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RETAINER