Highwayman (5)
I believe the answer is:
thief
'highwayman' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for thief that I've seen before include "Unlawful taker" , "Crook" , "Pilferer" , "A robber or pickpocket" , "One who steals" .)