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All answers having "Carp" as clue:

3 Character Answers:

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KOI

NAG



4 Character Answers:

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DACE

FISH

RAIL



5 Character Answers:

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CAVIL

GRIPE

TENCH



6 Character Answers:

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KVETCH

NIGGLE



7 Character Answers:

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NITPICK

QUIBBLE

STICKLE



9 Character Answers:

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FINDFAULT



15 Character Answers:

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COMPLAINORCAVIL

QUIBBLEANDCAVIL