Information thief (6)
I believe the answer is:
hacker
'information thief' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for hacker that I've seen before include "Cyber-criminal" , "Cyber-terrorist" , "Chopper" , "One breaks into computer systems for nefarious purposes" , "One breaking into a computer system" .)