Dollar bills (4)
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">dollar bills</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for ones that I've seen before include "1 & 1 & 1" , "Singles" , "(Of ship) returning to port of origin" , "Singletons" , "Aces" .)