Non-panel applet gone missing, how do I bring it back?

When using the Ubuntu 18.04 live CD there was a clock ‘applet’ (I’m not really sure what its called) on the desktop, about halfway down, in front of the wallpaper (not situated within in a panel).
After installation, my version of that seems to have gone missing, how do I get it back?

Do check that you are fully up-to-date. Some updates were made in the last few hours.

Double check that the “Desktop Date & Time” applet is still in your panel - if it isnt then you’ll need to add it

I’ve updated, and re-added ‘Desktop Date and Time’ applet to my panel, and its working now, thanks for your help!