The ornamental design for element of a handbag, as shown and described.
FIG. 1 is a front perspective view of an element of a handbag showing my new design.
FIG. 2 is a front view of an element of handbag shown in FIG. 1;
FIG. 3 is a right side view of en element of handbag shown in FIG. 1;
FIG. 4 is a left side view of an element of handbag shown in FIG. 1; and,
FIG. 5 is a top view of an element of handbag shown in FIG. 1.
The broken line showing of the zippers, zipper pulls, body of bag, central piece, carabiner (non-locking), grommets, strap is for illustrative purposes only and forms no part of the claimed design.