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All answers having "Wrinkle" as clue:

4 Character Answers:

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IDEA

KNIT

LINE

MUSS

RUCK

RUGA

SEAM

SNAG



5 Character Answers:

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CRIMP

PURSE



6 Character Answers:

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COCKLE

CREASE

FURROW

PUCKER

RIMPLE

RUMPLE



7 Character Answers:

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AGELINE