Halloween

3. Iconic movie theme song released by Ray Parker Jr in 1984 (12)
6. Said suddenly to surprise someone (3)
7. Both a hypothetical spatial distortion, and a dance number in the Rocky Horror Picture Show (4,4)
9. Building often perceived as being inhabited by spirits of the deceased (7,5)
12. A comic entertainer, especially one in a circus (5)
15. "Trick or _____" (5)
16. Author of many popular horror books, including 'It', 'Carrie' and 'Pet Sematary' (7,4)

1. Only mammal capable of true and sustained flight (3)
2. A set of clothes worn in order to look like someone else, esp. for a party (7)
4. Originally due to be called 'Starlight', a popular Michael Jackson song (8)
5. Popular film genre for the month of October (6)
8. Fictional character from the 'Halloween' series of slasher films (7,5)
10. A Centuries-old vampire, and a Transylvanian nobleman (7)
11. Noise typically made by wolves and dogs (4)
13. Popularly depicted as a woman wearing a black cloak and pointed hat and flying on a broomstick (5)
14. Food item carved to ward off spirits (7)