Yank wearing leather jacket (6)
I believe the answer is:
jerkin
'leather jacket' is the definition.
(I've seen this before)
'yank wearing' is the wordplay.
'yank' becomes 'jerk' (synonyms).
'wearing' becomes 'in' (as in being 'in' certain clothes).
'jerk'+'in'='JERKIN'
(Other definitions for jerkin that I've seen before include "Short coat" , "sort of jacket" , "Tight, sleeveless, collarless jacket" , "Type of coat or jacket" , "sleeveless garment" .)