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All answers having "Straighten" as clue:

4 Character Answers:

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CONK

EVEN

MAKE

TRUE



5 Character Answers:

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ALIGN

ALINE



6 Character Answers:

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REHANG

UNBEND

UNCOIL

UNCURL

UNFURL

UNKINK

UNROLL



7 Character Answers:

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CLEANUP

UNCROSS

UNPLAIT

UNSNARL



8 Character Answers:

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UNFURROW

UNTANGLE