I get this problem too, especially when I'm sewing longer pieces together.
I solve this with an extra clover clip. I do my clipping along the seam (which is to the right as I'm sewing, of course) and then I put one last clip along the bottom of the fabric, about an inch to the left of where the seam will be, so it can stay there while I sew those last few stitches and not get hit by the presser foot.
For shorter pieces where I'm not doing any pinning/clipping I usually just hold it in place like in Onebyone's photo.