The ornamental design for the rear combination lamp for an automobile, as shown and described.
FIG. 1 is a perspective view of a rear combination lamp for an automobile of our new design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a top plan view thereof;
FIG. 5 is a bottom plan view thereof;
FIG. 6 is a right-side view thereof; and,
FIG. 7 is a left-side view thereof.
My design includes the mirror image of the embodiment depicted. In a second embodiment, the rear view of FIG. 3 forms no part of the claimed invention.