Implementing the Composite Pattern along with a Clean Architecture in an ASP.NET Core Web API involves multiple layers such as Presentation, Application, Domain, and Infrastructure. Additionally, you would need to create models, repositories, and services to achieve complete CRUD functionality. Below is a simplified example demonstrating the implementation. Note that this is a basic example, and in a real-world scenario, you might need to consider more advanced features, error handling, and security measures.
Let's consider a scenario where we have a DZoneArticle entity, and we want to perform CRUD operations on it.