The ornamental design for a frontspoiler for a vehicle, as shown and described.
FIG. 1 is a right, front perspective view of a front spoiler for a vehicle according to the design, the left, front perspective view being a mirror image thereof;
FIG. 2 is a front view thereof;
FIG. 3 is a left side view thereof;
FIG. 4 is a right side view thereof;
FIG. 5 is a bottom view thereof; and,
FIG. 6 is a right front perspective view thereof, showing a possible environment.
The broken lines in FIG. 1 illustrate portions of the front spoiler for a vehicle that form no part of the claimed design. The broken lines in FIG. 6 illustrate environmental structure that forms no part of the claimed design.