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 table for use in readying one's appearance.
FIG. 1 is a left, top, front perspective view of a standing support embodying my new design, the rear elevational view thereof not being visible in use;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a left side elevational view thereof, the right side elevational view thereof being a mirror image of the left side shown;
FIG. 4 is a bottom plan view thereof; and,
FIG. 5 is a top plan view thereof.
The broken line representations in the figures are for the purpose of illustration only, and form no part of the claimed design.