Disclosed are an apparatus, system and method for securing a metal wire or electric cable or ribbon or tape to a fence post with a T or Y section. A portion of the post surface may be deformed to facilitate mounting of the apparatus thereto. The apparatus, when attached to the post, enables various items to be secured at the post such as strands such as fence wire, wire grid or mesh, signage, panels, etc. The apparatus comprises projections that extend from a body, to define a recess therebetween. The recess is configured to receive a post flange therein. At least one of the projections comprises an element that is configured to deflect, relative to the projection, during mounting of the apparatus to the flange to allow the flange to be received in the recess. Once the flange has been received in the recess, the element deflects back and interacts with the deformed surface portion of the post to attach the apparatus to the post. At least one of the projections is also configured to be deflected to enable the post part to be received in the recess during mounting of the apparatus to the post part. The deformation may be an indentation in the post surface, or an aperture through the surface.
