Rogue I've confined to the nick (6)
'nick' is the definition.
(I've seen this before)
'rogue i've confined to the' is the wordplay.
'rogue' indicates anagramming the letters.
'confined to' indicates putting letters inside.
'ive' with letters rearranged gives 'iev'.
'iev' inserted within 'the' is 'THIEVE'.
(Other definitions for thieve that I've seen before include "Take illegally", "Misappropriate", "Pinch", "Knock off", "appropriate".)