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All answers having "Grouse" as clue:

4 Character Answers:

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BEEF

CARP

CRAB

KICK

MOAN

RAIL



5 Character Answers:

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GRIPE



7 Character Answers:

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GRUMBLE

SAGEHEN



8 Character Answers:

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COMPLAIN



9 Character Answers:

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PTARMIGAN



11 Character Answers:

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RAISEASTINK



14 Character Answers:

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GRUMBLEORWHINE



15 Character Answers:

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GRUMBLEANDGRIPE