FIG. 1 is a front elevation view showing my new design for a clip for a writing instrument;

FIG. 2 is a left side elevation view of the clip of FIG. 1, the right side view being a mirror image thereof;

FIG. 3 is a top plan view of the clip of FIG. 1;

FIG. 4 is a bottom plan view of the clip of FIG. 1;

FIG. 5 is a perspective view of the clip of FIG. 1;

FIG. 6 is a second perspective view of the clip of FIG. 1;

FIG. 7 is a front elevation view showing a second embodiment of the clip of FIG. 1;

FIG. 8 is a left side elevation view of the clip of FIG. 7, the right side view being a mirror image thereof;

FIG. 9 is a top plan view of the clip of FIG. 7;

FIG. 10 is a bottom plan view of the clip of FIG. 7;

FIG. 11 is a perspective view of the clip of FIG. 7; and,

FIG. 12 is a second perspective view of the clip of FIG. 7.

The broken line showing of a pen cap and barrel in the drawings illustrates environmental matter and forms no part of the claimed design.