Thief has object prohibited, we hear (6)

I believe the answer is:

bandit

I'm a little stuck... Click here to teach me more about this clue!

'thief' is the definition.
(bandit is a kind of thief)

I don't understand the rest of the clue.

(Other definitions for bandit that I've seen before include "Highwayman" , "Violent outlaw" , "Armed robber in the Wild West" , "Violent robber" , "Crook" .)

I've seen this clue in The Mirror.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.