The ornamental design for a utensil for a whisk, as shown and described.
FIG. 1 is a front, top, and side view of the utensil for a whisk, showing my new design;
FIG. 2 is a rear, bottom and side view of the utensil for a whisk illustrated in FIG. 1;
FIG. 3 is a top view of the utensil for a whisk illustrated in FIG. 1;
FIG. 4 is a side view of the utensil for a whisk illustrated in FIG. 1, the opposite side of the utensil for a whisk is a mirror image of that which is illustrated in FIG. 4;
FIG. 5 is a bottom view of the utensil for a whisk illustrated in FIG. 1;
FIG. 6 is a rear view of the utensil for a whisk illustrated in FIG. 1; and,
FIG. 7 is a front view of the utensil for a whisk illustrated in FIG. 1.