Portion of a drug delivery device

FIG. 1 is a top, front, left perspective view a portion of a drug delivery device showing the new design in an assembled configuration;

FIG. 2 is a bottom, rear, right perspective view thereof;

FIG. 3 is a front elevation view thereof;

FIG. 4 is a rear elevation view thereof;

FIG. 5 is a left side elevation view thereof;

FIG. 6 is a right side elevation view thereof;

FIG. 7 is a top plan view thereof; and,

FIG. 8 is a bottom plan view thereof.

The portions depicted in broken lines of uneven length define the unclaimed boundary of the claimed design. The portions depicted in broken lines of even length form no part of the claimed design.