alarm clock on locked screen

Hello dopice,

Thanks for reaching out in Apple Support Communities. We understand that you would like to disable access to alarm clock setting while the screen is locked. We're happy to help.

Check out the following support article: 

Control access to information on the iPhone Lock Screen

Specifically, use these steps:

"Control Center"

Cheers!

Hi dopice,

Thanks for reaching us back. To confirm, you want to have access to change the Alarm settings after the alarm goes off?

If that is the case, you can send us your feedback here: iPhone Feedback