Woman named herein (4)
I believe the answer is:
here
'herein' is the definition.
(synonyms)
'woman named' is the wordplay.
'woman' becomes 'her' (her refers to a woman).
'named' becomes 'e' (I can't explain this - if you can you should give a lot more credence to this answer).
'her'+'e'='HERE'
Can you help me to learn more?
(Other definitions for here that I've seen before include "Present - at this point" , "The present location" , "On this spot" , "In attendance" , "final clue?" .)