### Clue: Group in Kuala Lumpur with a hot esoteric doctrine (8)
### Answer: KABBALAH 
 ### Explanation: Definition: esoteric doctrine
 ABBA(the Swedish singing group, once) **contained in**(in) KL(abbrev. for Kuala Lumpur, capital of Malaysia) **plus**(with) A + H(abbrev. for "hot").
Answer: A body of mystical teachings, often based on an esoteric interpretation of the Hebrew Scriptures.