How do you get duplicate app icons and how do you remove one of them?

[AC Question]

Somehow my Nexus 6 has duplicate clock icons. What makes it happen and how do you get rid of the duplicate?

 

[belodion]

It does sometimes happen, though I don't know why.
Long-press one of the icons and slide it up to 'Remove'.

 

[B. Diddy]

Welcome to Android Central! Just to clarify--are the duplicate icons in the App Drawer or the homescreen?