I claim the ornamental design for a shears having a light, as shown and described.
FIG. 1 is a perspective view of a shears having a light, showing my new design;
FIG. 2 is a left-side elevational view thereof;
FIG. 3 is a right-side elevational view thereof;
FIG. 4 is a rear elevational view thereof;
FIG. 5 is a front elevational view thereof;
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view thereof.
The evenly-spaced broken lines in the drawings illustrate portions of the shears having a light that form no part of the claimed design. The dash-dot-dash-type broken lines in the drawings illustrate the bounds of the claimed design but form no part thereof.