The ornamental design for a portion of a vehiclelamp, as shown and described.
FIG. 1 is a perspective view of portion of a vehicle lamp;
FIG. 2 is a top plan view thereof;
FIG. 3 is a bottom view thereof;
FIG. 4 is a front view of thereof, the opposite rear view being identical;
FIG. 5 is a right side view thereof, the opposite left side view being identical; and,
FIG. 6 is a perspective view of the portion of a vehicle lamp positioned on a representative warning lamp.
The broken lines in the drawings illustrate portions of or the environment related to the portion of a vehicle lamp which form no part of the claimed design.