Aware of Cockney's hide and seek tactic? (4-4)
I believe the answer is:
open-eyed
'aware' is the definition.
(thesaurus)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for open-eyed that I've seen before include "Forming an encrusted mass" , "Astonished - watchful" , "Surprised - aware" , "Astonished; fully aware" .)