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All answers having "Trousers" as clue:

4 Character Answers:

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ARIA

BAGS



5 Character Answers:

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JEANS

PANTS



6 Character Answers:

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SLACKS



8 Character Answers:

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BREECHES

BRITCHES

FLANNELS



9 Character Answers:

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LONGPANTS



11 Character Answers:

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PAIROFPANTS



12 Character Answers:

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UNUTTERABLES



14 Character Answers:

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BRITCHESANTEEL