Public meeting supporting everything except the leader (5)
I believe the answer is:
forum
'public meeting' is the definition.
(I've seen this in another clue)
'supporting everything except the leader' is the wordplay.
I cannot quite understand how this works, but
'supporting' could be 'for' (being for something means supporting it) and 'for' is found in the answer.
The remaining letters 'um' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for forum that I've seen before include "Meeting for debate" , "A meeting to exchange views" , "Internet message board" , "Arena for debate" , "Meeting of people for discussion" .)