"Filthy” money (5)
I believe the answer is:
lucre
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">filthy money</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for lucre that I've seen before include "ill-gotten gain" , "Archaic wealth, may be filthy" , "benefits from crime" , "Scornful word for money that may be 1 Across" , "Money or wealth" .)