Discussion venue that supports hesitation? (5)
I believe the answer is:
forum
'discussion venue' is the definition.
(a forum is a place for discussion)
'that supports hesitation?' is the wordplay.
'that supports' becomes 'for' (for, in favour of).
'hesitation?' becomes 'um' (um is said in hesitation).
'for'+'um'='FORUM'
(Other definitions for forum that I've seen before include "A place for discussing" , "Tribunal" , "Place where public meeting or discussion is held" , "Ground for discussion" , "A meeting to exchange views" .)