The ornamental design for a rearcombinationlamp for an automobile, as shown and described.
FIG. 1 is a perspective view of a rear combination lamp for an automobile showing my new design;
FIG. 2 is a front view thereof;
FIG. 3 is a left side view thereof; and,
FIG. 4 is a top view thereof.
The features illustrated in very dark shading are not in view during the ordinary use and operation of the article and therefore are not part of the design claimed. Rear view, Bottom view and Right side view form no part of the claimed portion of the design.