Crossword Genius

Arrive to restrain exhibitionist erasing last of the calm (9)

Ross

I believe the answer is:

composure

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'the calm' is the definition.
(synonyms)

I don't understand the remainder of the clue.

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(Other definitions for composure that I've seen before include "Aplomb" , "Calm self-control" , "Self-possession" , "Coolness" , "Calm state" .)

I've seen this clue in The Independent.
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