Hang ominously (4)
I believe the answer is:
loom
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">hang ominously</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 loom that I've seen before include "Apparatus for weaving cloth" , "Textile machine; come into sight" , "'Appear as a vague form, perhaps threatening (4)'" , "Appear large and indistinct, to weave?" , "Impend; weaving machine" .)