The ornamental design for a displayscreen with icon, as shown and described.
FIG. 1 illustrates a front view of a display screen with icon according to a first embodiment; and,
FIG. 2 illustrates a front view of a display screen with icon according to another embodiment.
The sharp-cornered, vertically-oriented broken-line rectangle in the figures illustrates the perimeter of the display screen of a mobile electronic device. The broken lines outside this perimeter illustrate portions of the mobile electronic device. The broken lines within this perimeter illustrate features on the display screen in the environment of the claimed design. The broken lines form no part of the claimed design.