Many a diploma signer (4)

I believe the answer is:

dean

(Other definitions for dean that I've seen before include "Administrator of a college department" , "Head of e.g. faculty" , "Clergyman; narrow valley" , "Glos. forest; Dixie ---, Everton hero" , "Church or college dignitary" .)

I've seen this clue in The New York Times.

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