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All answers having "Wrench" as clue:

3 Character Answers:

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TUG



4 Character Answers:

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TEAR

TOOL

TURN



5 Character Answers:

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ALLEN

CRICK

WREST



6 Character Answers:

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SPRAIN

TORQUE



7 Character Answers:

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CONTORT

SPANNER



8 Character Answers:

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LOOSENER