Foreboding sign (4)
I believe the answer is:
omen
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">foreboding sign</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 omen that I've seen before include "Portent of evil" , "Event regarded as a prophetic sign of good or evil" , "Harbinger, augury" , "Sign of things to come" , "Foreboding" .)