If the Reason ONE clock is offline, you will not be able to enter the clock settings to remove it from the app. Go to the Home tab of the Reason Home app. To remove the clock, you can press and hold down on the clock tile and wait for a message to pop up. It will ask you if you wish to remove the clock. Tap OK to proceed.
If you do not wish to remove the clock but instead want to reconnect it (turn it online), please follow these instructions instead.