Divergence
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">divergence</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that divergence can be written as departure)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for departure that I've seen before include "Variation from the expected" , "Act of leaving" , "Exit" , "Lucky" , "Not the usual" .)