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All answers having "Uses" as clue:

4 Character Answers:

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EATS



5 Character Answers:

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MILKS

PLIES



6 Character Answers:

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AVAILS

EATSON

EXERTS

LIESON

SITSIN

SPENDS

WIELDS



7 Character Answers:

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APPLIES

EMPLOYS

RIDESIN

TYPESON



8 Character Answers:

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PURPOSES



15 Character Answers:

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AVAILSONESELFOF