I claim the ornamental design for a hair clip, as shown and described.
FIG. 1 is a Perspective view of a hair clip showing my new design;
FIG. 2 is Front view thereof;
FIG. 3 is Back view thereof;
FIG. 4 is a Right-side view thereof;
FIG. 5 is a Left-side view thereof;
FIG. 6 is a Top view thereof; and,
FIG. 7 is a Bottom view thereof.
The broken lines in the drawing depicting the screw in FIG. 1, the circular elements on the pivot in FIGS. 4 and 5 and the circular element in FIG. 6 are for illustrative purposes only and form no part of the claimed design.