Watchful, alert (4-4)
I believe the answer is:
open-eyed
This clue is a double definition.
'watchful' is the first definition.
(I've seen this before)
'alert' is the second definition.
(I've seen this before)
(Other definitions for open-eyed that I've seen before include "Astonished; fully aware" , "Surprised - aware" , "Astonished - watchful" , "Forming an encrusted mass" .)