Operatic heroine is from history? Not entirely (6)
I believe the answer is:
isolde
'operatic heroine' is the definition.
(I've seen this before)
'is from history? not entirely' is the wordplay.
I cannot really understand how this works, but
'is' is within the answer.
'from' could be 'o' (I've seen this in other clues) and 'o' is present in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for isolde that I've seen before include "heroine (sic)" , "Tristan and ... (Wagner opera)" , "Tristan's lover, sadly soiled" , "Lover of Tristan" , "Soiled like Tristan's lover" .)