After striking gold with 2016’s space odyssey Splendor & Misery, L.A. experimental hip-hop trio Clipping now takes a more sinister approach. The underground subgenre known as horrorcore is now the vocation for rapper-actor (and Broadway star) Daveed Diggs’ technical, intense flow and the harsh, immersive textures of co-producers William Hutson and Jonathan Snipes.…