Word ending a threat (4)
I believe the answer is:
else
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">word ending a threat</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 else that I've seen before include "Other than (what is under consideration)" , "Besides, otherwise" , "As an alternative" , "Otherwise; different from" , "Adverb meaning if not, otherwise" .)