Dump swine's tacky jacket (6)
I believe the answer is:
pigsty
'dump' is the definition.
(I've seen this in another clue)
'swine's tacky jacket' is the wordplay.
'swine's' becomes 'pig's' (pig is a kind of swine).
'jacket' means to remove the middle letters (the letters worn by the word as a 'jacket' are use).
'tacky' with its middle removed is 'ty'.
'pigs'+'ty'='PIGSTY'
(Other definitions for pigsty that I've seen before include "Animal home in the farmyard" , "Dirty domicile" , "Dirty place; animal pen" , "Porker pen" , "Untidy place" .)