US monetary unit (6)
I believe the answer is:
dollar
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">us monetary unit</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 dollar that I've seen before include "US monetary unit" , "100 cents" , "Foreign currency" , "Standard monetary unit of many countries" , "Economic factors deployed as 'soft power'" .)