Spotlight is a useful shortcut to search for content (applications, mail, contacts) on your iPhone or iPad. However it has a problem: Your search interfered by the previous search text.
When you search, find and click something in spotlight on iPhone and iPad, does it necessary to see the phrase I typed (most of the cases, long time ago) again in the search bar? Is it necessary for the text I typed to get sticked? Who cares what they typed long before? ... And even when clicking the "clean" button is so hard/tiny to reach and click!
To access Spotlight, swipe down on your home screen to reveal the search field. This is what usually happens when I forget how the spotlight works: I forget to delete the previous search. It is especially the case if I am in hurry. Apple please provide a way to make the search in spotlight non-sticky for your users' sake!