Dresses sank unevenly, stuffed with a newspaper (7)
I believe the answer is:
kaftans
'dresses' is the definition.
(kaftan is a kind of dress)
'sank unevenly stuffed with a newspaper' is the wordplay.
'unevenly' indicates anagramming the letters (uneven implies the letters must be disrupted).
'stuffed with' is an insertion indicator (I've seen this in other clues).
'newspaper' becomes 'ft'.
'sank' with letters rearranged gives 'kans'.
'a'+'ft'='aft'
'kans' enclosing 'aft' is 'KAFTANS'.
(Other definitions for kaftans that I've seen before include "Full-length cloaks worn by men in the Levant" , "Long, loose robes" .)