Alarm Clock Icon Gone. On the left side select troubleshoot. Search for clock in the list of apps and select the entry.
Press and hold the power or sleep/wake button and the volume down button at the same time. Switching off an alarm when it rings. to delete the alarm entirely:
Alarm Clock Icon Animation by Josh Duncan on Dribbble
I figured it out.after clearing all reminders and alarms.i went and started clearing app caches and data.and got as far as alexa's cache. instead of going to settings > apps and notifications > default apps, it’s a different approach for the clock app. You will notice a icon for the alarm clock. to delete the alarm entirely: