Former Spanish currency unit (6)
I believe the answer is:
peseta
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">former spanish currency unit</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for peseta that I've seen before include "Former Spanish coin" , "Out of date bread" , "Old tender" , "Coin from the sea pet" , "Formerly the basic unit of money in Spain" .)