Notice seating in or out (11)
I believe the answer is:
resignation
'notice' is the definition.
(handing in your notice is resigning)
'seating in or out' is the wordplay.
'out' indicates anagramming the letters (out can mean wrong or inaccurate).
'seating'+'in'+'or'='seatinginor'
'seatinginor' is an anagram of 'RESIGNATION'.
(Other definitions for resignation that I've seen before include "acquiescence" , "Calm acceptance" , "Giving up job" , "Acceptance of the inevitable" , "surrender" .)