Nigh (8)
I believe the answer is:
imminent
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">nigh</span>' is the definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for imminent that I've seen before include "Approaching fast" , "now expected" , "Likely to happen at any moment" , "Close at hand, about to occur" , "Liable to occur soon" .)