Crossword Genius

Keystone's place (4)

Ross

I believe the answer is:

arch

'keystone's place' 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 "Mysterious - curve" , "Clever" , "one under a foot?" , "spanner" , "Curve spanning an opening" .)

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