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All answers having "Use +" as clue:

3 Character Answers:

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ADD



4 Character Answers:

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WEAR



5 Character Answers:

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AVAIL

EXERT

ITSNO

SPEND

WIELD



6 Character Answers:

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DEPLOY

EMPLOY



7 Character Answers:

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OPERATE



8 Character Answers:

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EXERCISE



10 Character Answers:

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EMPLOYMENT



11 Character Answers:

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APPLICATION

CONSUMPTION



15 Character Answers:

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TAKEADVANTAGEOF