Concurred (6)
I believe the answer is:
agreed
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">concurred</span>' is the definition.<br/ ><span class="explanation-format__explanation">('agree' can be a synonym of 'concur')</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for agreed that I've seen before include "'Concurred, assented (6)'" , "In accord" , "Acceded" , "That's right" , "matched" .)