Crossword Genius

Keen-eyed alumnus with man (9)

Ross

I believe the answer is:

observant

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

'alumnus with man' is the wordplay.
'alumnus' becomes 'ob' (old boy).
'with' is a charade indicator (letters next to each other).
'man' becomes 'servant' (I've seen this before).
'ob'+'servant'='OBSERVANT'

(Other definitions for observant that I've seen before include "keeping close eye on things" , "Alert" , "following religious practices" , "Watchful" , "Orthodox" .)

I've seen this clue in The Times.
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