Agree to (6)
I believe the answer is:
accede
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">agree to</span>' is the definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for accede that I've seen before include "bow" , "'Acquiesce, defer (6)'" , "Agree (to request)" , "Allow, acquiesce" , "Agree (to) - come into office" .)