Maiden name I grieve over, divorce ultimately twice dismissed (6)
I believe the answer is:
'maiden' is the definition.
(I've seen this before)
'name i grieve over divorce ultimately twice dismissed' is the wordplay.
I cannot really understand how this works, but
'name' could be 'vi' and 'vi' is present in the answer.
'i' is present in the answer.
This may be the basis of the clue (or it may be nonsense).
(Other definitions for virgin that I've seen before include "A person who has never had sex" , "Vestal" , "New" , "Unsullied" , "Not yet used" .)