Lives in a dress that is slovenly (7)
I believe the answer is:
resides
'lives in' is the definition.
(I've seen this before)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for resides that I've seen before include "stays in Peebles" , "stayed in Scotland" , "stays required" , "Sojourns" , "Lives, dwells" .)