Big break (6)
I believe the answer is:
schism
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">big break</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for schism that I've seen before include "Split, especially ecclesiastical" , "Breach or division within church" , "Split based on opposing beliefs" , "Split, rift" , "break" .)