In places like Iraq and Afghanistan, you have traditional councils — called shura, jirga, etc. — where the clan chiefs gather to settle issues, Greying Wanderer notes, and they operate on consensus:
In an environment where nepotism is the norm, decisions must be made by consensus, because in that kind of environment a winner-takes-all system results in the winner literally taking all and dividing it up among his relatives and allies.
In the West you can (or could) have a winner takes all system because the winner doesn’t literally take all.
So it seems to me the tectonics of clannishness requires a different national-scale democratic model built around consensus and not the western model. The western winner-takes-all democratic model on clannish tectonics is simply a recipe for civil strife.