Crossword Genius

Fully alert (4-4)

Ross

I think it could be either:

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4-4

4-5

open-eyed

(Other definitions for open-eyed that I've seen before include "Forming an encrusted mass" , "Astonished - watchful" , "Astonished; fully aware" , "Surprised - aware" .)

I've seen this clue in the Sydney Morning Herald.
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