Crossword Genius

With which the head expresses assent (3)

Ross

I believe the answer is:

nod

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'assent' is the definition.
(I've seen this in another clue)

I don't understand the rest of the clue.

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(Other definitions for nod that I've seen before include "Show assent" , "Assenting head gesture" , "Gesture of acceptance" , "Cain left Eden for the Land of . . ." , "slight bow" .)

I've seen this clue in The Irish Independent.
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