Class securing university meeting place (5)
I believe the answer is:
forum
'meeting place' is the definition.
(synonyms)
'class securing university' is the wordplay.
'class' becomes 'form' (synonyms).
'securing' indicates putting letters inside.
'university' becomes 'U' (abbreviation for university).
'form' going around 'u' is 'FORUM'.
(Other definitions for forum that I've seen before include "discussion group" , "Place where public discussion is held, as in ancient Rome" , "Court - conference" , "Internet message board" , "Public meeting or assembly for open discussion" .)