Crossword Genius

Frank looked perceptive (4-4)

Ross

I believe the answer is:

open-eyed

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'perceptive' is the definition.
Both the definition and answer are adjectives. Perhaps there's a link between them I don't understand?

'frank looked' is the wordplay.
'frank' becomes 'open' (synonyms).
'looked' becomes 'eyed' (eyeing is a kind of looking).
'open'+'eyed'='OPEN-EYED'

Can you help me to learn more?

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

I've seen this clue in The Daily Express.
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