Break away (6)
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">break away</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that break away can be written as secede)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for secede that I've seen before include "Withdraw formally from membership or alliance" , "'Withdraw, break away (6)'" , "Formally withdraw (from federal union)" , "'Withdraw formally, from a political body perhaps (6)'" , "Withdraw from a body, a nation say" .)