By the time it was done rising, the bottom of the dough was already larger than the bottom of my clay pot, but I "squeezed" the dough (that still had a parchment paper underneath it) into the clay pot and baked it anyhow.
It turned out OK!
Apparently the dough "grew" upwards, since there was no room for it to grow sideways. I've got myself a tall loaf of bread. Awesome.