The Loom is a Crafting plot in a Clan Citadel that allows you to gain the resource Cloth. A tier 5 or higher Citadel is required to build it.
You can collect cloth for your clan's resource pool by interacting with the loom. The loom will have a batch of cotton upon it that you can turn into cloth. You must use all of the cotton on each loom before the cloth automatically replenishes. As the loom is upgraded, more individual looms are added - starting with one pair at tier 1 to four pairs at tier 7.
A tip for using the loom is to watch the spinning rolls of thread at the top of the loom tower. Once they stop spinning, players may start another action on the loom.