Besides, otherwise (4)
I believe the answer is:
else
<span class="explanation-format__ClueExplanation">This clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">besides</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >'<span class="explanation-format__original">otherwise</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ ></span>
(Other definitions for else that I've seen before include "In addition; different" , "Besides, otherwise" , "As an alternative" , "In addition, besides" , "Alternatively" .)