Outlaw, brigand (6)
I believe the answer is:
bandit
I believe this is a double definition.
'outlaw' is the first definition.
(I know that bandit is a type of thief)
'brigand' is the second definition.
(synonyms)
(Other definitions for bandit that I've seen before include "Enemy aircraft" , "Armed outlaw" , "Crook" , "Violent robber" , "Thief" .)