Breaks away (7)
I believe the answer is:
secedes
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">breaks away</span>' is the definition.<br/ ><span class="explanation-format__explanation">('secede' can be a synonym of 'break away')</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for secedes that I've seen before include "Breaks away" , "Withdraws from an organization" , "makes a withdrawal" .)