In moral decline (8)
I believe the answer is:
decadent
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">in moral decline</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for decadent that I've seen before include "Morally corrupt" , "Lacking in moral vigour" , "Self-indulgent or immoral" , "Abandoning principles" , "Rotten" .)