Down-at-heel (6)
I believe the answer is:
shabby
'down-at-heel' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for shabby that I've seen before include "Run down" , "Worn and run-down, like clothes" , "Dingy - dirty" , "Worn and dirty; mean" , "Dowdy" .)