Crossword Genius

Very quick, when working out? (8)

Ross

I believe the answer is:

cracking

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'working out?' is the definition.
(crack can mean to decipher or work out)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for cracking that I've seen before include "failing" , "great!" , "Wonderful" , "Excellent; fracturing" , "very fast" .)

I've seen this clue in The Guardian.
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