By a clitoral hood piercing only the clitoral hood is stitched, not the clitoris itself.
This can happend both vertical and horizontal and also in combination. You should let stotch this piercing only by an experienced piercer so it won´t be stitched too even and grows out again. The piercing through the clitoral hood belongs to the least painful and most uncomplicated piercings in accomplishment and healing. The ball of the jewellery should be supported at the clitoris to get a pleasant wear feeling and the expected allure.