The ornamental design for a standingsupport, as shown and described.
In a preferred embodiment, the nature of this product is a standing support such as a vanity for use in supporting a lavatory or a console table for use in readying one's appearance.
FIG. 1 is a right, top, front perspective view of a standing support embodying our new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a right side elevational view thereof, the left side elevational view thereof being a mirror image of the right side shown;
FIG. 4 is a top plan view thereof;
FIG. 5 is a bottom plan view thereof; and,
FIG. 6 is a rear elevational view thereof.
The broken lines are for environmental purposes only and form no part of the claimed design.