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All answers having "Brace" as clue:

3 Character Answers:

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DUO

TWO



4 Character Answers:

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DUAD

DYAD

GIRD

PAIR

PROP

SPAN

STAY



5 Character Answers:

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CABER

CLAMP

SHORE

STEEL

STRUT

TENSE



6 Character Answers:

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PROPUP



7 Character Answers:

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ADVERSE

TWOSOME



8 Character Answers:

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BUTTRESS