Reeks (6)
I believe the answer is:
stinks
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">reeks</span>' is the definition.<br/ ><span class="explanation-format__explanation">('stink' can be a synonym of 'reek')</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for stinks that I've seen before include "Chemistry (school slang)" , "Smells unpleasant" , "Smells to high heaven" .)