Crossword Genius

Central block of an arch (8)

Ross

I believe the answer is:

keystone

(Other definitions for keystone that I've seen before include "What tops an arch" , "Piece at the top of a masonry arch" , "Kop" , "Central block at the summit of an arch" , "Important piece at apex of arch" .)

I've seen this clue in The Times.
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