Crossword Genius

Keystone setting (4)

Ross

I believe the answer is:

arch

'keystone setting' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for arch that I've seen before include "Construction with a keystone" , "Marble, for example" , "Roguish - superior" , "Foremost" , "Chief - supporter - cunning" .)

I've seen this clue in The Wall Street Journal.
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