Place for open discussion (5)
I believe the answer is:
forum
'place for open discussion' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for forum that I've seen before include "Ancient Roman marketplace or place for public discussions" , "Internet message board" , "Place where public discussion is held, as in ancient Rome" , "A place for discussing" , "discussion group" .)