Behold new professor in city (6)
I believe the answer is:
london
'city' is the definition.
(London is an example)
'behold new professor' is the wordplay.
'behold' becomes 'lo'.
'new' becomes 'n'.
'professor' becomes 'don' (I've seen this before).
'lo'+'n'+'don'='LONDON'
'in' acts as a link.
(Other definitions for london that I've seen before include "City for the non-old, oddly" , "Jack - , US author (White Fang); city" , "British capital" , "English capital" , "Construction across the Thames near the Monument" .)