Discussion not up to be raised before closing parts of summit conference (6)
I believe the answer is:
debate
'discussion' is the definition.
(I know that debate is a type of discussion)
'raised before closing parts of summit conference' is the wordplay.
'closing' indicates one should take the final letters (the letter which ends or closes the word).
'parts of summit conference' becomes 'bate' (I can't justify this - if you can you should believe this answer much more).
The final letters of 'raised before' are 'de'.
'de'+'bate'='DEBATE'
'not up to be' is the link.
This may not be correct. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for debate that I've seen before include "Discuss with opposing arguments" , "Argue a point" , "Formal discussion through argument" , "Formal public discussion" , "Talk" .)