Crossword Genius

Old pupil a bright one nothing escapes (7)

Ross

I believe the answer is:

alumnus

'old pupil' is the definition.
(I've seen this before)

I don't understand the remainder of the clue.

(Other definitions for alumnus that I've seen before include "Former school pupil" , "Old pupil" , "School or college graduate" , "Former pupil or student" , "(US) college graduate" .)

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