So, I've clipped the data frame using the extent of a polygon. I'm also using data-driven pages to create maps showing several regions. I also have a geographic grid added the data frame. The shape of the clip feature displays outside the data frame and causes an issue with the grid display. This shape is also exported to the PDF. Suggestions for how to resolve or work around this issue would be welcome.
Can you provide more details, exact steps and settings? I tried to reproduce this, but it worked correctly for me. I probably did something different from you.
Not sure if I got your question correctly? Is the outline of the clip feature getting displayed on the Data-frame bothering you? You might to turn-off the clip feature in the Table of Contents?