"I know what you're thinking" ability (3)
I believe the answer is:
esp
'i know what you're thinking ability' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for esp that I've seen before include "Second sight (abbr)" , "Extrasensory perception (abbrev.)" , "Initially, clairvoyance or telepathy" , "Apparent power to perceive things that others can't, in short" , "Apparent power to perceive things that others can't, initially" .)