This app was mentioned in 2 comments, with an average of 2.00 upvotes
I use Ringquis to make ringtones and alarms. Moto X doesn't offer native support for it.
https://play.google.com/store/apps/details?id=com.baquis.ringquis
If you have an alarm set, you can tap it in the upper left of the notification shade to open the Clocks app. Otherwise, there is no other shortcut to the app.
https://play.google.com/store/apps/details?id=com.baquis.ringquis
Just use this to clip and convert your music for an alarm. You can still use the stock clock app.