Answer: WEREWOLF

AnswerCrossword Clue
WEREWOLFLycanthrope
werewolfa person transformed into a wolf or capable of assuming a wolf's form
werewolf(in folklore) a human turned into a wolf
werewolfa person who supposedly changes into a wolf, also WERWOLF
WEREWOLFPeriodic monster
WEREWOLFIt's not always a beast
WEREWOLFHorror film creature, maybe
WEREWOLFOne on a lunar calendar?
WEREWOLFProfessor Lupin in Harry Potter books, e.g.
WEREWOLF"..... of London" (1935 film)
WEREWOLFCasanova's costume?
WEREWOLF"Twilight"'s Jacob, e.g.
WEREWOLFHorror-movie figure
WEREWOLFCreature in folklore
WEREWOLFLycanthrope.
WEREWOLFCreature of folklore.
WEREWOLFPerson turned into an animal: Folklore.
WEREWOLFMovie monster who changes when there's a full moon
WEREWOLFOne likely to howl at a full moon
WEREWOLF"An American ... in London" (1981 movie)
WEREWOLFHe's not always a beast
WEREWOLFHairy man-monster