Teach about oriental goddess of evil (6)
I believe the answer is:
hecate
'goddess of evil' is the definition.
'hecate' can be an answer for 'goddess' (thesaurus). I'm not certain of the 'of evil' bit.
'teach about oriental' is the wordplay.
'about' indicates an anagram.
'oriental' becomes 'e' (**).
'teach' anagrammed gives 'hecat'.
'hecat'+'e'='HECATE'
(Other definitions for hecate that I've seen before include "underworld figure" , "Ancient goddess found in the ace" , "Greek goddess associated with witchcraft and the ghost world" , "evil witch" , "Goddess of dark places gets the ace" .)