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