Is it possible to get the glue off so the pieces fit together? I can't find anything in Google about it.
Depends which type of glue it is. If it’s epoxy, you can forget it because it sets extremely hard and would likely damage the pot to get it off.
If it’s superglue (cyanoacrylate) then you might be able to file it back to get a clean edge. It’s important to get rid of as much as you can. It’s not worth putting fresh glue onto old glue as it won’t do the job.
Maybe some other suggestions will come in, but that’s all I can think of for now.
Ps: wear a mask when filing glue, it’s not the nicest of dust to breath in