Answer: blackmagic

AnswerCrossword Clue
BLACKMAGIC

Sorcery

BLACKMAGIC

Mystic art in tune of '40s.

BLACKMAGIC

"That old ... . . . "

BLACKMAGIC
Invocation of devils.
BLACKMAGIC
Witchcraft
BLACKMAGICOccult art
BLACKMAGICVoodoo
BLACKMAGICBad spelling?
BLACKMAGIC"That old" stuff of song
BLACKMAGICArt that uses curse words?
BLACKMAGICNecromancy
BLACKMAGICBad spells