The ornamental design for a support for a snowshovel, as shown and described.
FIG. 1 is a top, rear perspective view of a support for a snow shovel
showing my new design, the broken-line showing of the blade and handle
being for illustrative purposes only and forming no part of the claimed
design;
FIG. 2 is a rear elevational view thereof;
FIG. 3 is a front elevational view thereof; and
FIG. 4 is a left side elevational view thereof, the right side being a
mirror image.