You can pin this dialog to the taskbar and clicking it would open the analog clock. This workaround doesn’t require installation of any third party app or widget.
However, you can use the Windows 11’s Date & Time Settings dialog as an analog clock. The other option is to install a Clock Widget from Microsoft store to enable a digital or analog clock. The Windows Widgets panel has a digital clock on the top which can be opened by clicking or hovering on the Widget button in the taskbar. Windows 11 doesn’t support an analog clock in the Action Center or the Calendar flyout that pops out when you click on the taskbar clock. How to Pin an Analog Clock to the Taskbar in Windows 11 However, if you are looking for a bigger digital clock or an analog clock like those present in the older versions of Windows then you will have to look for a workaround. Those users who were used to this feature to view system time may have to enable an additional clock in the calendar panel. In Windows 10, this flyout had a digital clock which is missing in Windows 11.