Marble, perhaps, in architectural use (4)

I believe the answer is:

arch

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'marble perhaps in architectural use' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Maybe you can see a link between them that I don't see?

This is the entire clue.

Can you help me to learn more?

(Other definitions for arch that I've seen before include "Curved spanning structure" , "Affectedly playful (4)" , "Bend into upward curve" , "not to go straight?" , "Masonry structure for spanning an opening" .)

I've seen this clue in the Evening Standard.

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