What shows one’s composed and performed for, new documentation following? (9)

'what shows one's composed' is the definition.
(sangfroid is composure or coolness)

'performed for new documentation following?' is the wordplay.
'performed' becomes 'sang'.
'new' is an anagram indicator.
'documentation' becomes 'ID' (identification documents).
'following?' is a charade indicator (letters next to each other).
'for' anagrammed gives 'fro'.
'sang'+'fro'+'id'='SANGFROID'

'and' acts as a link.