Russian currency unit (6)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">russian currency 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 rouble that I've seen before include "Foreign money" , "Currency of 13" , "Unit of money in Russia" , "Russian money" , "Russian monetary unit" .)
(Other definitions for kopeck that I've seen before include "Russian copper" , "One hundred of these make one rouble" , "Russian coin" , "little Russian money" , "One-hundredth of a rouble" .)