Senior member is university lecturer, you gathered (5)
I believe the answer is:
doyen
'senior member' is the definition.
(I've seen this before)
'university lecturer you gathered' is the wordplay.
'university lecturer' becomes 'don' (I've seen this before).
'you' becomes 'ye'.
'gathered' means one lot of letters goes inside another.
'don' enclosing 'ye' is 'DOYEN'.
'is' acts as a link.
(Other definitions for doyen that I've seen before include "Respected expert" , "Senior member of a profession or academy" , "Prominent person in a particular field" , "Group's senior member" , "Man who is the senior in his profession" .)