Crossword Genius

Agrees with the head (4)

Ross

I believe the answer is:

nods

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'agrees' is the definition.
(I've seen this before)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for nods that I've seen before include "Non-verbal indications of assent" , "Signals assent" , "Shows assent" , "Makes mistake" , "Is careless" .)

I've seen this clue in The Mirror and The Daily Express.
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