Bit of bunco (4)
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">bit of bunco</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 scam that I've seen before include "An informal swindle" , "Swindle (sl.)" , "fiddle" , "Screw" , "Confidence trick, swindle" .)