Robber in gang, Italian (6)
I believe the answer is:
bandit
'robber' is the definition.
(bandit is a type of robber)
'gang italian' is the wordplay.
'gang' becomes 'band' (both can mean a group of people).
'italian' becomes 'it' (common abbreviation).
'band'+'it'='BANDIT'
'in' acts as a link.
(Other definitions for bandit that I've seen before include "Crook" , "Violent outlaw" , "Outlaw, brigand" , "Dan bit the robber badly" , "Outlaw, robber" .)