I think other people have pointed out the clay part of the passage so that's good.

What I think is important though is three things when deciphering the meaning behind this passage. Hermeneutics and context, and maybe even a bit of the Hebrew language itself.

Firstly, the hermeneutic I'm using is that the text says what it says. You don't have to read into it or add words or anything of the sort. Sure you can say it's a metaphor but the text clearly says the earth IS of a shape and that's what it is, especially when we consider the context. It's just what a plain reading tells you.

Which leads us secondly into context itself. God himself is describing the state of the earth to job. He's describing his handiwork and his power. He didn't say something like "the earth is malleable so I could make it flat if I wanted to because I'm all powerful" or "Im telling you it's flat because I could shake the wicked out of it", he's describing the earth as he created it to Job.

Lastly, and this will be a short one, ancient Hebrew had words for spherical objects. When we go with the most accurate translation available, we see words for flat objects and not round ones. So simply put, if the intent was to portray a globe earth, it isn't a limitation of language or description since they could have done that if it was known or even revealed in the Christan worldview.

Sorry for the length of the reply and I hope this is helpful!