Thief
There are a few possibilities for this:
'thief' is the definition.
(bandit is a kind of thief)
This is the entire clue.
(Other definitions for bandit that I've seen before include "Armed outlaw" , "Outlaw, brigand" , "Thief" , "Outlaw, robber" , "hood" .)
'thief' is the definition.
(I know that robber is a type of thief)
This is the entire clue.
(Other definitions for robber that I've seen before include "Mugger" , "Violent thief" , "Highwayman, for example" , "One who thieves" , "Burglar" .)
'thief' is the definition.
(I know that pickpocket is a type of thief)
This is all the clue.
(Other definitions for pickpocket that I've seen before include "Thief working in public places" , "Tea leaf" , "Cutpurse" , "Dip" , "Artful Dodger?" .)
'thief' is the definition.
(I know that shoplifter is a type of thief)
This is all the clue.
(Other definitions for shoplifter that I've seen before include "Thief" , "Robber" , "Criminal (in a retail context)" , "Thieving customer" , "guilty party" .)
'thief' is the definition.
(cat burglar is a kind of thief)
This is all the clue.
(Another definition for catburglar that I've seen is " Criminal".)
'thief' is the definition.
(I know that burglar is a type of thief)
This is the entire clue.
(Other definitions for burglar that I've seen before include "Housebreaker" , "Thief who enters a building to steal" , "Building robber" , "Thief (entering building)" , "He takes" .)
'thief' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for crook that I've seen before include "Swindler - crosier - ill (in Australia)" , "Bend; criminal; staff" , "Fence, perhaps" , "Well, no" , "Professional criminal" .)