Sentence:  In the mid-1860s a <WSD>duffer</WSD> named James Harnell, who went by the nickname Narran Jim, had taken stock he′d stolen from the district around Culgoa and Narran rivers across Queensland to the Cooper....An alert Bulloo Downs stockman contacted the police, and when Police Inspector Fitzgerald and eight Aboriginal troopers tracked Narran Jim and surrounded him while he was sleeping, the cattle <WSD>duffer</WSD> woke to find himself looking down the barrel of Fitzgerald′s revolver and seven years in jail. 
Meaning of the word marked with <WSD> tags:  A cattle thief or thief of other livestock; one who alters the brands of cattle.