Crossword Genius

Cross, as one scuttling off? (6)

Ross

I believe the answer is:

crabby

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'cross' is the definition.
(synonyms)

I don't understand how the rest of the clue works.

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(Other definitions for crabby that I've seen before include "Bad-tempered, irritable" , "In bad temper" , "Cantankerous like crustacean" , "Ill-tempered" , "Bad-tempered like common crustacean" .)

I've seen this clue in The Telegraph.
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