Ledge Clip is a glitch where Link can clip through a floor and wall that are perpendicular to each other. Although this can be performed as both child and adult link, only adult link can clip through the floor because child link clips back in bounds due to his small body hitbox.
Right as you are about to hang of the ledge, L Target. If done correctly, Link will clip on the floor. Note that this is frame perfect, so it might be tricky to get consistently unless you time it well. A consistent strat is targeting the wall then sidehop the opposite direction of the ledge, sidehop back next to the ledge, then dry roll (it will make Link roll to the side automatically), then time the L target to clip.