Arrive to restrain exhibitionist erasing last of the calm (9)
I believe the answer is:
composure
'the calm' is the definition.
(synonyms)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for composure that I've seen before include "Aplomb" , "Calm self-control" , "Self-possession" , "Coolness" , "Calm state" .)