The ornamental design for a thumbrest for a clarinet, as shown and described.
The patent or application file contains at least one drawing executed in color. Copies of this patent or patent application publication with color drawing(s) will be provided by the Office upon request and payment of the necessary fee.
1.1 is a front view of a thumb rest for a clarinet showing my new design;
1.2 is a rear view thereof;
1.3 is a left side view thereof;
1.4 is a right side view thereof;
1.5 is a top view thereof;
1.6 is a bottom view thereof; and
1.7 is a top, front, and right side perspective view thereof.
In the reproductions, the blue colored areas illustrate portions of the thumb rest for a clarinet that form no part of the claimed design.