Question [Q] How do I replace the default TouchWiz clock?

I would like to completely replace the Samsung clock app with I'd like to be sure that any time an app launches the clock, that this runs and not the terrible Samsung clock app. How can I do this?

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Samsung Galaxy S4 i9500 - ROM: Wanam Lite. Still the best i9500 ROM I have used.
Samsung Google Nexus 10 - ROM: SlimKat weekly.