The ornamental design for a standinglamp, as shown and described.
FIG. 1 is a front view of a standing lamp showing my new design, the back side being symmetrical to the front view;
FIG. 2 is a right view of the standing lamp shown in FIG. 1, the left side being symmetrical to the right view;
FIG. 3 is a top view of the standing lamp shown in FIG. 1;
FIG. 4 is a front view of an alternate embodiment of the standing lamp, the back side being symmetrical to the front view;
FIG. 5 is a right view of the embodiment of the lamp shown in FIG. 4, the left side being symmetrical to the right view; and,
FIG. 6 is a top view of the embodiment of the lamp shown in FIG. 4.
The structural elements in the figures depicted by means of broken lines have been shown for the purposes of illustrating portions of the standing lamp which form no part of the claimed design.