Meeting university dons arrange (5)
I believe the answer is:
forum
'meeting' is the definition.
(forum is a kind of meeting)
'university dons arrange' is the wordplay.
'university' becomes 'u' (abbreviation for university).
'dons' means one lot of letters goes inside another (don means to wear or put on).
'arrange' becomes 'form' (I can't explain this - if you can you should believe this answer much more).
'u' put within 'form' is 'FORUM'.
Can you help me to learn more?
(Other definitions for forum that I've seen before include "Roman meeting place" , "A meeting to exchange views" , "discussion group" , "Place where public discussion is held, as in ancient Rome" , "Place of assembly for the people in ancient Greece" .)