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All answers having "Benefit" as clue:

3 Character Answers:

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AID

NAB

SAK

USE



4 Character Answers:

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BOON

CELL

GAIN

GALA

HELP

PERK

PLUS

SAKE

VOLT



5 Character Answers:

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ABBEY

ASSET

AVAIL



6 Character Answers:

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BEHALF

DOGOOD

FRINGE

PROFIT

UPSIDE



7 Character Answers:

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BEHOOVE

RETSINA



8 Character Answers:

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INTEREST

OFCLERGY



9 Character Answers:

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ADVANTAGE