It smells (4)
I believe the answer is:
nose
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">it smells</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 nose that I've seen before include "Grass" , "Deserving blame" , "Snout" , "Pry" , "Don't cut this off to spite your face" .)