Close to a conclusion (6)
I believe the answer is:
ending
I believe this clue is a double definition.
'close' is the first definition.
(I know that close can be written as ending)
'to a conclusion' is the second definition.
(synonyms)
(Other definitions for ending that I've seen before include "Putting a stop to" , "Climax" , "Last part" , "Finish" , "ultimately" .)