To object (5)
I believe the answer is:
demur
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">to object</span>' is the definition.<br/ ><span class="explanation-format__explanation">(to demur is to object to something)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for demur that I've seen before include "Dissent, object" , "Hesitation" , "Raise mild objection" , "Hesitate from uncertainty or object" , "Politely disagree" .)