Crossword Genius

How one became ever more firm with? (8)

Ross

I believe the answer is:

steadily

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'how' is the definition.
Both the definition and answer are adverbs. Maybe you can see a link between them that I can't see?

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for steadily that I've seen before include "with regularity" , "Regularly, constantly" , "Surely and regularly" , "Unfalteringly; gradually" , "In unfaltering manner" .)

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