Disapprove of (6)
I believe the answer is:
oppose
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">disapprove of</span>' is the definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for oppose that I've seen before include "Resist; disapprove of" , "Act against" , "Argue against" , "Bar" , "Resist (someone)" .)