Sign of assent (3)
I believe the answer is:
nod
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">sign of assent</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for nod that I've seen before include "Sign of assent or salutation" , "Show recognition" , "'A . . . is as good as a wink to a blind horse'" , "positive sign" , "Land of exile" .)