Apple introduced Notification Center in iOS 5, but even after 2 major iOS software updates i.e. iOS 6 and iOS 7, you still have tap on the x button, followed by the Clear button, to dismiss notifications for an app from it.If you find it annoying then install a jailbreak tweak called NCSingleTapClear.
It lets you dismiss Notifications for an app with a single tap from Notification Center. When you tap on the x button, it will no longer show you the Clear button, and instead remove the Notifications,
It’s simple tweak, it doesn’t come with any configurations. I still hope developer of Lorem updates the tweak for iOS 7 and iPhone 5s, so individual notifications can be dismissed with a swipe.
NCSingleTapClear is available for free on Cydia. It is compatible with iOS 7 and 64-bit A7 chip so works even on iPhone 5s.
Let me know how it goes.