Loom (6)
I believe the answer is:
impend
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">loom</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for impend that I've seen before include "appearing to be imminent" , "Threaten; approach" , "Become imminent" , "Threaten - be about to happen" , "Be imminent or about to happen" .)