Outlaw in gang with modern technology (6)
I believe the answer is:
bandit
'outlaw' is the definition.
(bandit is a kind of outlaw)
'gang with modern technology' is the wordplay.
'gang' becomes 'band' (both can mean a group of people).
'with' means one lot of letters go next to another.
'modern technology' becomes 'it' (Information Technology).
'band'+'it'='BANDIT'
'in' acts as a link.
(Other definitions for bandit that I've seen before include "Member of a gang of robbers" , "Armed robber in the Wild West" , "Dan bit the robber badly" , "Member of a robber gang" , "Crook" .)