I came across your request while looking at some other questions. The previous respondent thought this might be a spider egg sack, which it does somewhat resemble. However, I believe that this is actually the mud nest of a type of potter wasp or mason wasp, most likely in the genus Eumenes (Family Vespidae, Subfamily Eumeninae). These wasps are related to the paper wasps and hornets. However, they do not form colonies, and each female creates her own nests, often using mud as the nest material. Sometimes they will use existing holes to make their nests, but some species build these distinctive little mud pots as a chamber in which to raise their young. Depending on the species, the female will capture and paralyze beetles, caterpillars or spiders and place them into the pot. When full, she will lay an egg inside and seal over the opening. The cache of food inside is enough for the wasp larvae to feed on and complete its development. Once she seals the pot, she leaves and goes off to create another. When the wasp larva completes its development, it will pupate inside the pot and eventually emerge as a new adult. Your photo shows the pot as being open. That could mean that it was a relatively new nest that was still being filled by the female with prey, or it could be an old nest from which a new wasp has already emerged. They typically do not re-use the old nest. So its possible your nest may have had some spiders associated with it, however, they would have been food for the immature wasp and not the ones that created the nest. I have included a link to a website with more information about these wasps and their nests, or you can search for potter wasp to find more information and images.

https://en.wikipedia.org/wiki/Potter_wasp