The ornamental design for a clip, as shown and described.
FIG. 1 is a perspective view of a clip 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, a left side view being symmetrical to the right side view;
FIG. 5 is a plan view thereof;
FIG. 6 is a bottom view thereof;
FIG. 7 is a cross-sectional view taken in the direction of arrows 7--7 in FIG. 2; and,
FIG. 8 is a second perspective view thereof, the sheets of paper depicted by means of broken lines being shown for illustrative purposes only and forming no part of the claimed design.