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All answers having "Fret" as clue:

4 Character Answers:

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FUME

STEW



5 Character Answers:

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BROOD

CHAFE

ERODE

RIDGE

WORRY



6 Character Answers:

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ABRADE

REPINE



7 Character Answers:

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AGONIZE

SWEATIT



8 Character Answers:

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IRRITATE

STARTLED