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All answers having "Pants" as clue:

4 Character Answers:

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CAMO

KNEE

TROU



5 Character Answers:

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CAPRI

GASPS

HAREM

HUFFS



6 Character Answers:

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BRIEFS

HEAVES

SLACKS

SMARTY



7 Character Answers:

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APPAREL

YFRONTS



8 Character Answers:

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BREATHES

BRITCHES

KNICKERS

MENSWEAR

TROUSERS



11 Character Answers:

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GASPSFORAIR