The ornamental design for a candle, as shown and described.
FIG. 1 is a perspective view of the candle showing a new design;
FIG. 2 is a front elevational view of the candle of FIG. 1, the rear view of which is identical;
FIG. 3 is a right side view of the candle of FIG. 1, the left side view of which is identical;
FIG. 4 is a top view of the candle of FIG. 1;
FIG. 5 is a bottom view of the candle of FIG. 1; and,
FIG. 6 is a perspective view of another embodiment of the candle.
The wick, wick holder, and metal melting plate depicted in the various figures above are shown in broken lines and form no part of the claimed invention and are disclaimed.