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I've set fence posts in clay by pouring water in the hole first, and then adding the clay to make mud that drys as hard as a brick
I wish I had that kind of clay, unfortunately I don't. It doesn't absorb water to break down at all. I guess that's why we now have to have these elaborate septic systems, so the moisture evaporates instead of soaking into the ground. When I did the 6 ground rods for my electric fence, I started the rods by digging a 12" deep hole. I drove the rods as far as I could and then filled the holes with water. The next morning the holes were still full all the way to the top as I left them the day before. It took me a week to finally get them all in.
I told the DW if we ever move, I'll be checking the ground. No more red clay for me...LOL.