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 the icon enlarged and separate for clarity; and,
FIG. 2 is a front view of a display screen with icon showing the new design.
The even-length broken line showing of the remainder of the display screen is for environmental purposes only and forms no part of the claimed design. The uneven-length broken line in FIG. 1 forms the boundary of the region shown in FIG. 2, and forms no part of the claimed design.