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All answers having "Crab" as clue:

3 Character Answers:

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NAG



5 Character Answers:

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GRUMP



6 Character Answers:

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CANCER

CATCHA

GROUCH

HERMIT

NEBULA



7 Character Answers:

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DECAPOD

SEAFOOD



8 Character Answers:

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COMPLAIN



9 Character Answers:

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BELLYACHE

SOURAPPLE



10 Character Answers:

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CROSSPATCH

MALCONTENT



15 Character Answers:

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LOCALMENUSTAPLE