Crossword Genius

Keen-eyed old boy and man (9)

Ross

I believe the answer is:

observant

'keen-eyed' is the definition.
(I've seen this before)

'old boy and man' is the wordplay.
'old boy' becomes 'OB' (abbreviation for a private school 'old boy').
'and' says to put letters next to each other.
'man' becomes 'servant' (man can mean someone's personal servant).
'ob'+'servant'='OBSERVANT'

(Other definitions for observant that I've seen before include "Keen-eyed" , "Good at noticing" , "Alert" , "Closely watching" , "attentive to detail" .)

I've seen this clue in The Sun.
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