Robber born with that certain something ... (6)
I believe the answer is:
'robber' is the definition.
(bandit is a type of robber)
'born with that certain something' is the wordplay.
'born' becomes 'b' (abbreviation next to the year of someone's birth).
'with' becomes 'and'.
'that certain something' becomes 'it' (eg a pop star may be said to have 'it').
(Other definitions for bandit that I've seen before include "Member of a gang of robbers" , "Member of a robber gang" , "Enemy aircraft" , "Marauder" , "Crook" .)