Official expert studies university lecturer (9)
I believe the answer is:
proconsul
'official' is the definition.
(proconsul is a kind of official)
'expert studies university lecturer' is the wordplay.
'expert' becomes 'pro' (short for professional).
'studies' becomes 'cons' (to con is to study or revise).
'university' becomes 'U' (abbreviation as in UMass).
'lecturer' becomes 'l' (abbreviation for lecturer).
'pro'+'cons'+'u'+'l'='PROCONSUL'
(Other definitions for proconsul that I've seen before include "Ancient Roman provincial governor" , "magistrate" .)