Crossword Genius

Structure with a keystone (4)

Ross

I believe the answer is:

arch

'structure with a keystone' 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 "Curved part of stone bridge, perhaps" , "Instep of foot" , "Clever" , "Roguish, teasing" , "Cunning; span" .)

I've seen this clue in the USA Today, the Newsday.com, The Guardian, The Washington Post, the LA Times and the L.A. Times Daily.
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