Psychic communication (9)
I believe the answer is:
telepathy
'psychic communication' is the definition.
(telepathy is a kind of psychic communication)
This is all the clue.
(Other definitions for telepathy that I've seen before include "Ability to read someone's mind" , "Communication from one mind to another, no speech" , "Thought transference - they leapt (anag)" , "ESP" , "Apparent thought transference" .)