I claim the ornamental design for a closure for a carton, as shown and described.
FIG. 1 is a top front perspective view of a closure for a carton mounted to a carton having the door to the closure in a closed position, the broken line showing of the carton depicting environment subject matter only and forming no part of the claimed design;
FIG. 2 is a top view of the closure of FIG. 1;
FIG. 3 is a bottom view of the closure of FIG. 1, as the broken line showing of the support ribs and mounting walls depicting environment subject matter only and forming no part of the claimed design;
FIG. 4 is a side view of the closure of FIG. 1;
FIG. 5 is a side view of the closure of FIG. 1 showing the side opposite that is shown in FIG. 4;
FIG. 6 is a front view of the closure of FIG. 1; and,
FIG. 7 is a back view of the closure of FIG. 1.
In FIGS. 4–7, the broken line showing of the inner mounting wall depending downward beyond the outer mounting depicts environment subject matter only and forms no part of the claimed design.