Tragic heroine's flogged in Irish domain (6)
I believe the answer is:
isolde
'tragic heroine's' is the definition.
'isolde' can be an answer for 'heroine's' (I've seen this before). I am not certain of the 'tragic' bit.
'flogged in irish domain' is the wordplay.
'flogged' becomes 'sold' (flog can mean to sell).
'in' is an insertion indicator.
'irish domain' becomes 'ie' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'sold' going into 'ie' is 'ISOLDE'.
Can you help me to learn more?
(Other definitions for isolde that I've seen before include "princess of legend" , "Arthurian queen" , "King Mark's betrothed (Wagner)" , "Tristan's beloved" , "Soiled like Tristan's lover" .)