Woman cited inapt arrangement that was not expected (13)
I believe the answer is:
unanticipated
'not expected' is the definition.
(I've seen this before)
'woman cited inapt arrangement' is the wordplay.
'woman' becomes 'una' ().
'arrangement' indicates an anagram.
'cited'+'inapt'='citedinapt'
'citedinapt' anagrammed gives 'nticipated'.
'una'+'nticipated'='UNANTICIPATED'
'that was' acts as a link.
(Other definitions for unanticipated that I've seen before include "Not foreseen" , "Not expected" .)