Yank wearing jacket (6)
I believe the answer is:
jerkin
'jacket' is the definition.
(I know that jerkin is a type of jacket)
'yank wearing' is the wordplay.
'yank' becomes 'jerk' (synonyms).
'wearing' becomes 'in' (in certain clothing).
'jerk'+'in'='JERKIN'
(Other definitions for jerkin that I've seen before include "sort of jacket" , "sleeveless garment" , "Sleveless jacket" , "jacket with no sleeves or collar" , "Short coat" .)