Charlie uses a branch of science to disrupt those occultists (8)
I believe the answer is:
psychics
'occultists' is the definition.
(I know this)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for psychics that I've seen before include "They claim to have occult powers of communication with the dead" , "People with occult powers or extrasensory perception" , "Mind-readers" , "People with occult powers like mediums" , "They claim clairvoyance" .)