Add lots of organic matter to the soil and mulch your plants deeply. I think gypsum is a soil additive that helps loosen clay. Clay soil holds water for a long time so water deeply and not so often.
I don't know if I'd do raised beds where it's really hot. I made a raised bed for my strawberries last year so I had something on which to attach bird-netting hoops. The strawberries died on the hot, south side. It's a lot hotter in Texas than in Minnesota where I am. I honestly don't understand spending a bunch of money building raised beds and filling them with commercial potting soil.