Crossword Genius

Be a bellyacher (4)

Ross

I believe the answer is:

crab

(Other definitions for crab that I've seen before include "Edible crustacean" , "one is a fiddler" , "Scuttling crustacean" , "Stalk-eyed crustacean" , "Sourpuss < to wreck" .)

I've seen this clue in the Newsday.
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