How can I restore the deleted Clock app on my iPhone?

I accidentally deleted my Clock app, which I live by. I set alarm clocks for everything to function throughout the day. When I went to some of the other questions I asked about deleting and adding back apps, I tried everything that I saw and replies and nothing works. When I open the app Library, I don’t see Clock to drag it from there; and when I go to the app store, to try to re-add the app, it doesn’t give me the cloud to tap to re-get the app it just says open. So what do I do? I need this restored Today really! Please help somebody.

[Re-Titled by Moderator]