The Clarity filter enhances the local contrast in an image. Its greatest influence is in the mid-tonal range. This results in a sharpening effect.
In Photo Persona, this filter can be applied as a non-destructive, live filter. It can be accessed via the Layer menu, from the New Live Filter Layer category.
In Develop Persona, this filter is available on the Basic panel (Enhance).
The following settings can be adjusted in the filter dialog: