Demonstrate against (7)
I believe the answer is:
protest
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">demonstrate against</span>' is the definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for protest that I've seen before include "State objection" , "Complain" , "Objection from potters" , "Express opposition" , "Public demonstration" .)