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All answers having "Trimming" as clue:

4 Character Answers:

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GIMP

LACE

PING



5 Character Answers:

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BRAID



6 Character Answers:

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FRINGE

PARING



7 Character Answers:

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PRUNING



8 Character Answers:

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ADORNING

BRAIDING



9 Character Answers:

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GARNITURE



13 Character Answers:

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PASSEMENTERIE