One's marriage has been dissolved (8)
I believe the answer is:
divorcee
'one's marriage has been dissolved' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for divorcee that I've seen before include "One's marriage has been dissolved" , "One's broken up" , "old union member" , "Legally separated person" , "Legally separated woman" .)