The ornamental design for a clipperhead, as shown and described.
FIG. 1 is a front perspective view of a clipper head showing our new design;
FIG. 2 is a rear perspective view thereof;
FIG. 3 is a rear elevation view thereof;
FIG. 4 is a front elevation view thereof;
FIG. 5 is a left side elevation view thereof;
FIG. 6 is a right side elevation view thereof;
FIG. 7 is a top plan view thereof; and,
FIG. 8 is a bottom plan view thereof.
The dot dash lines in the figures represent an unclaimed boundary line and form no part of the claimed design. The even spaced broken lines are for purposes of illustrating environment and form no part of the claimed design.