Crossword Genius

Knowing what may be Norman (4)

Ross

I believe the answer is:

arch

I'm a little stuck... Click here to teach me more about this clue!

'knowing' is the definition.
(I've seen this before)

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

Can you help me to learn more?

(Other definitions for arch that I've seen before include "Curve that spans an opening" , "part of fingerprint" , "Supporting structure" , "Curved form" , "one under a foot?" .)

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