I claim the ornamental design for the display screen portion with icon, as shown and described.
FIG. 1 is a front view of an display screen portion with icon, as showing my new design; and,
FIG. 2 is a top view of an display screen portion with icon showing my new design depicted on a touch sensitive mobile device's display screen.
The broken lines in FIGS. 1 and 2 showing: an exterior square with rounded corners; the portion of the display screen; the touch sensitive mobile device; the border of the interior square with rounded corners; the callout bubbles; and, the center of the horizontal and rectangular lines in the notebook holes and the four horizontal and rectangular lines of the design are for illustrative purposes only and form no part of the claimed design.