Controlling features which move in and out of a clip

[847396730]

Please see the attached: the orange lines on the right are a state route which bends in and out of the clip.  The clip is the data driven feature layer, and is based on a percentage of the county line's perimeter (read: not changeable). Can python help me control this line and others like it?  I would happily accept its complete omission or its full inclusion.  Thank you!

[ChrisMathers]

Clip honors selections. Just select which ones you want before running the clip.

[847396730]

This is a data driven index layer clip, not a traditional chop-up-the-data clip, so selecting ahead of time has no effect.

[ChrisMathers]

Definition queries perhaps? You can edit a layer objects definition query as a property of the object.

[847396730]

A definition query applied to the layer will apply to every page of the map book in the data driven pages.  There is a page definition query, but its only capability is to show a) geometry which matches the current data driven page or b) geometry which doesn't match the current data driven page.  So even if you broke all your data and assigned it a value to its page, you wouldn't be able to express a piece of geometry as belonging to two pages.