Leaving statement that shows acceptance (11)

I believe the answer is:
resignation
'acceptance' is the definition.
(I have seen 'Calm acceptance ' mean 'resignation' so perhaps 'acceptance' could also mean 'resignation')
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for resignation that I've seen before include "Giving up job" , "surrender" , "Acceptance of the inevitable" , "Notice" , "acquiescence" .)
