The ornamental design for a cover for concealment, as shown and described.
FIG. 1 is a front isometric view of a cover for concealment showing our new design;
FIG. 2 is a front isometric view in a first alternate position;
FIG. 3 is a front isometric view in a second alternate position;
FIG. 4 is a front isometric view in a third alternate position;
FIG. 5 is a left view of FIG. 1;
FIG. 6 is a right view thereof;
FIG. 7 is a bottom view thereof;
FIG. 8 is a bottom view in an alternate position; and,
FIG. 9 is a front isometric view of multiple covers for concealment arranged in an environment thereof.
Broken line illustrations of environmental surroundings form no part of the claimed design. The broken lines and unshaded regions bounded by broken lines form no part of the claimed design.