The ornamental design for a displayscreen with icon, as shown and described.
FIG. 1 is a front view of a display screen with icon showing my/our new design;
FIG. 2 is a front view of the display screen with icon showing an alternative embodiment of the new design; and,
FIG. 3 is a front view of the display screen with icon of FIG. 1 shown on a device.
The broken line showing of the remainder of the user interface and the remainder of the display screen is for environmental purposes only and forms no part of the claimed design.