Except that (6)
I believe the answer is:
unless
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">except that</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 unless that I've seen before include "Otherwise than if" , "Except on the condition that" , "Conjunction meaning except when" , "Though" , "bar" .)