Refuse to deal with (7)
I believe the answer is:
boycott
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">refuse to deal with</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 boycott that I've seen before include "ex-Yorkshire cricket captain" , "Refuse to handle or deal with" , "send to Coventry" , "Refuse to deal with - outlaw" , "Refuse to buy or handle goods" .)