Crossword Genius

What actually happens if you've been keeping up your skills (2,8)

Ross

I believe the answer is:

in practice

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'what' is the definition.
Both the definition and answer are adverbs.
Maybe you can see an association between them that I don't see?

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Another definition for in practice that I've seen is " Actually".)

I've seen this clue in the Evening Standard.
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