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All answers having "Curtail" as clue:

3 Character Answers:

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CUT



4 Character Answers:

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CLIP

CURB

DOCK

PARE

STEM

TRIM



5 Character Answers:

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ELIDE

LIMIT

SLASH



6 Character Answers:

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HAMPER

REININ



7 Character Answers:

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ABRIDGE

SHORTEN



8 Character Answers:

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CUTSHORT

RETRENCH

TRUNCATE