Glib Fellow advanced, taking in university (6)
I believe the answer is:
fluent
'glib' is the definition.
(thesaurus)
'fellow advanced taking in university' is the wordplay.
'fellow' becomes 'f' (abbreviation - of a society etc.).
'advanced' becomes 'lent' (money**).
'taking in' means one lot of letters goes inside another.
'university' becomes 'u'.
'lent' enclosing 'u' is 'luent'.
'f'+'luent'='FLUENT'
(Other definitions for fluent that I've seen before include "Fully competent in a language" , "Easy and graceful in motion" , "Eloquent, silver-tongued" , "Able to express oneself easily" , "Competent (of language) - graceful (of movement)" .)