Crossword Genius

Arch support (8)

Ross

I think it could be either:

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8

6*

keystone

'arch support' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for keystone that I've seen before include "Important piece at apex of arch" , "Central part of arch" , "Something on which all else depends" , "Central principle of a policy" , "Central block at the top of an arch" .)

I've seen this clue in The Sun.
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