Silent assent (3)
I believe the answer is:
nod
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">silent assent</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 "Signify agreement" , "What Homer may sometime do" , "Shake head in agreement" , "Indicate 25 [YES]" , "Go to sleep in this land" .)