I have a 7290 and do see an alarm clock icon, maybe it's hidden?
Show all the hidden icons by pressing the ALT or Half Moon key and clicking in on the trackwheel. Select Show All from the menu.
Unhide an Icon by selecting the icon or program, hit the ALT key and click in on the trackwheel, uncheck or select the Hide Application option. Your app icon will show up on the main screen again.