Manipulate fraudulently (3)
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">manipulate fraudulently</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 rig that I've seen before include "Oil-drilling device" , "Oil platform" , "Masts, spars and sails on a vessel" , "Apparatus; (boat's) sails" , "Outfit; fix" .)