Crossword Genius

Like crab that's cold? (5)

Ross

I believe the answer is:

nippy

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'that's cold?' is the definition.
('nippy' can be similar in meaning to 'cold')

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for nippy that I've seen before include "Fast - cold" , "Quickly-moving" , "like the wind?" , "Sharp" , "brisk" .)

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