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 Human link and Zora link, only Zora can clip through the floor because Human 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.