Shameful, dirty (6)
I believe the answer is:
sordid
This clue is a double definition.
'shameful' is the first definition.
(thesaurus)
'dirty' is the second definition.
(similar in meaning)
(Other definitions for sordid that I've seen before include "'Seamy, seedy (6)'" , "Filthy - base" , "Seedy, foul" , "Morally degraded" , "Squalid and depraved" .)