Cap for a dispenser

FIG. 1 is a top, front, and left side of an ornamental design of a cap for a dispenser, showing our new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left side elevational view thereof, the right side elevational view being a mirror image thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof.

The broken lines in the figures illustrate the portions of the design that form no part of the claimed design.