Hello. Welcome to Android Central.
You want to slide a widget back to your main homescreen.
If you tap on the Apps icon in the right (usually, or centre) of the bottom dock it takes you to your app 'drawer' or apps icon screens. There will be a tab high up to switch to widgets screens, all alphabetical.
You either want a choice of clock icons, that you may be able to re-size (you'll see the one you had) - or perhaps you had a weather widget with date and time. If you have the AccuWeather app, it's widget is called Weather, so under W.
Hold a widget and slide left or right where homescreens appear.
Your little darling probably swiped the widget up which would remove it from a homescreen. Sorry about the baby steps.
