Wordlessly agree (3)
I believe the answer is:
nod
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">wordlessly agree</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for nod that I've seen before include "Gesture of approval with head" , "Appear to fall asleep" , "What Homer may sometime do" , "Affirmative action?" , "Assenting head gesture" .)