The ornamental design for a clamp for surgicalinstrument, as shown and described.
FIG. 1 is a perspective view of a clamp for surgical instrument showing our new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is left side view thereof;
FIG. 5 is a right side view thereof;
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view thereof.
The broken line in FIG. 7 is included for the purpose of illustrating a portion of the clamp for surgical instrument and forms no part of the claimed design.