Pulled a fast one on (5)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">pulled a fast one on</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 duped that I've seen before include "Fooled, codded" , "Tricked" , "Deceived" , "Taken for a ride" , "Hoodwinked and misled" .)
(Other definitions for conned that I've seen before include "Deceived" , "Taken in, tricked" , "Studied; cheated" , "Studied carefully" .)