Crossword Genius

Crack code's initial change, turning spades into clubs (7)

Ross

I believe the answer is:

crevice

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'crack' is the definition.
(synonyms)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for crevice that I've seen before include "Narrow crack" , "Cleft, fissure" , "Narrow rock fissure" , "Crack or fissure." , "Opening" .)

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