Crossword Genius

Eager to behead giant (4)

Ross

I believe the answer is:

agog

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

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for agog that I've seen before include "Interested, excited and eager to know more" , "Eagerly expectant" , "Enthusiastic" , "All ears" , "Receptive - wide-mouthed" .)

I've seen this clue in The Times and The Sunday Times.
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