Crossword Genius

How a card-sharp's cards differ from others? (8)

Ross

I believe the answer is:

markedly

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'how' is the definition.
Both the definition and answer are adverbs. Perhaps they are linked in a way I don't understand?

I cannot understand how the rest of the clue works.

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(Other definitions for markedly that I've seen before include "In a clearly noticeable manner" , "Prominently, distinctly" .)

I've seen this clue in the Evening Standard.
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