Nauseating (7)
I believe the answer is:
noisome
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">nauseating</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that nauseating can be written as noisome)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for noisome that I've seen before include "Repellent" , "Unpleasantly smelling" , "Evil-smelling, objectionable (7)" , "Harmful - offensive" , "Having an extremely offensive smell" .)