Banish from group (9)
I believe the answer is:
ostracise
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">banish from group</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 ostracise that I've seen before include "Drive out" , "Socrates and I are made to exclude from society" , "I, Socrates may exclude from group" , "Blacklist" , "Exclude, blackball" .)