Leaving dramatic chapter out (7)
I believe the answer is:
exiting
'leaving' is the definition.
('exit' can be a synonym of 'leave')
'dramatic chapter out' is the wordplay.
'dramatic' becomes 'exciting' (I've seen this before).
'chapter' becomes 'c' (abbreviation).
'out' is a deletion indicator.
'exciting' with 'c' taken out is 'EXITING'.
(Other definitions for exiting that I've seen before include "Going out" , "Leaving" .)