Crossword Genius

Piece of Norman architecture (4)

Ross

I believe the answer is:

arch

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'piece' is the definition.
(arch is a kind of piece)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for arch that I've seen before include "Marble, for example" , "Curved part of the foot" , "Consummate" , "Curved entrance" , "Coyly playful" .)

I've seen this clue in the Evening Standard.
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