I find it easy to start something from a little advanced level, rather than starting from scratch every time. As an example, I want to create a grant based on this.
Actual behaviors
What we want
What does "clone" mean? Copy and paste content from an existing page to another? When would this be a common usecase? Can you please provide examples?
Maybe you want the Extension:InputBox with the preload options. Just type in the new page name and click to have the content preloaded.
See https://commons.wikimedia.org/wiki/Commons:Deletion_requests/Listing_a_request_manually for an example
Or look at https://www.mediawiki.org/wiki/Manual:Parameters_to_index.php#Edit_and_submit for "preload" directly.