I claim the ornamental design for a cup holder for winch, as shown and described.
FIG. 1 is a side elevation view of the cup holder for winch, shown in place on a winch, having a cup therein;
FIG. 2 is a bottom and side perspective view of the cup holder for winch;
FIG. 3 is a top and side perspective view of the cup holder for winch;
FIG. 4 is bottom view of the cup holder for winch;
FIG. 5 is top plan view of the cup holder for winch;
FIG. 6 is side elevation view of the cup holder for winch; and,
FIG. 7 is a bottom and side perspective view of the cup holder for winch.
The broken line drawing of the winch and cup in FIG. 1 is included for the purpose of illustrating environment only and forms no part of the claimed design.