Postmates is an app that helps people order food from local restaurants. The company has a delivery service that covers almost 100% of the United States and Canada.
A Postmates clone is similar to Postmates but it focuses on delivering food rather than other items. There are many companies out there that have this same business model, including Doordash and Grubhub.
There are two ways a Postmates clone works: one is by using a courier service to deliver the food, which is what most of these companies do; or they serve as an online marketplace where restaurants can sell their food directly to consumers with no middleman involved.