1) Certain deviant, casually 2) Deviant in slang 3) Freak, of a sort 4) Lech 5) One peeping inappropriately 6) Sicko 7) Weirdo in camper van Found on https://www.crosswordclues.com/clue/perv
PERV: Acronym for the porcine endogenous retrovirus, a pig virus that splices into DNA. PERV belongs to the same class of viruses as the human immunodeficiency virus (HIV). Some of the concern about pig-to-human transplantation revolves around PERV. Found on http://www.medterms.com/script/main/art.asp?articlekey=11297