Ban on trade (7)
I believe the answer is:
embargo
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">ban on trade</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 embargo that I've seen before include "Restraint - prohibition" , "Legal stoppage of commerce" , "Legal restraint" , "Ban, veto" , "Prevent publication" .)