Whenever you perform a Spotlight search by typing search terms in the Spotlight search bar, and then exit the search, the Spotlight search field remains populated when you swipe back to the Spotlight search screen. This is how Spotlight search works with stock settings.
ClearOnOpen is a new jailbreak tweak that forces the Spotlight search field to clear when coming back to the Spotlight search page. If you'd like to see how it works in action, then check after the break as we guide you via our video walkthrough.