Clock stuck in upper right hand corner, how do I get rid of it?

A friend of mine is having issues with his samsung galaxy s4, there is a clock stuck in the upper right hand corner of the screen. Not the one that is suppose to be there... he's not sure what he installed on his phone, to be able to uninstall it, and I've gone thru the phone... without any luck... I'm at a loss, other than deleting everything he's got on it one by one just to see what it was... next step... so if anyone has any ideas... that would be great...
Thanks!!!
Lenore/smoochiebb20021