Crossword Genius

It has a keystone (4)

Ross

I believe the answer is:

'it has a keystone' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for arch that I've seen before include "Supporting structure" , "Affectedly playful like senior angel" , "Mischievous - shrewd" , "Mischievous - curve" , "Devilish" .)

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