Former Spanish monetary unit (6)
I believe the answer is:
peseta
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">former spanish 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 peseta that I've seen before include "Old unit of money in Spain" , "Formerly, unit of Spanish money" , "Old tender" , "currency being superseded" , "Old Spanish currency" .)