The ornamental design for a pickup for drum, as shown and described.
FIG. 1 is a perspective view of the front, top and right side of a pickup for drum showing my new design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a right side view thereof, the left side being a mirror image;
FIG. 5 is a top view thereof;
FIG. 6 is a bottom view thereof; and,
FIG. 7 is a perspective reference view of usage thereof.
The broken line showing of the pickup for drum is included for the purpose of illustrating portions of the pickup for drum and forms no part of the claimed design.