Knitted jacket (8)
'knitted jacket' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for cardigan that I've seen before include "Welsh town; garment" , "Man in charge" , "Noble officer" , "corgi" , "Lord and outer garment" .)
(Other definitions for cardie that I've seen before include "Knitted jacket that buttons up the front (abbr)" , "Jumper (colloq.)" .)