Cunning structure of wedge-shaped stones (4)

I believe the answer is:

arch

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This might be a double definition.

'cunning' is the first definition.
(arch can mean cunning or tricksy)

'structure of wedge-shaped stones' is the second definition.
'arch' can be an answer for 'structure' (arch is a kind of structure). I'm not certain of the 'of wedge-shaped stones' bit.

Can you help me to learn more?

(Other definitions for arch that I've seen before include "Inner part of foot" , "Affectedly playful (4)" , "Cunning; principal" , "(archaic)" , "Devilish" .)

I've seen this clue in The Times.

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