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All answers having "Brisk" as clue:

4 Character Answers:

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ALLO

PERT

SPRY



5 Character Answers:

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AGILE

ALERT

ALIVE

CRISP

FRESH

NIPPY

PERKY

RAPID

SMART

SWIFT

ZIPPY



6 Character Answers:

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CHILLY

LIVELY

SNAPPY



7 Character Answers:

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ALLEGRO

ROARING



9 Character Answers:

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