The ornamental design for a portion of a displayscreen with icon, as shown and described.
FIG. 1 is a front view of a first embodiment of a portion of a display screen with icon showing my new design;
FIG. 2 is a front view of a second embodiment of a portion of a display screen with icon showing my new design; and,
FIG. 3 is a front view of a third embodiment of a portion of a display screen with icon showing my new design.
The outermost broken line rectangle in the figures showing the portion of the display screen and all other broken lines in the figures showing portions of the icon are included for the purpose of illustrating environment and form no part of the claimed design.