Wagner heroine (6)

I believe the answer is:

'wagner heroine' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for isolde that I've seen before include "Tristan and . . . . . . (medieval romance)" , "Irish princess" , "Tristram's lover, quite soiled" , "Soiled like Tristan's lover" , "Soiled like Tristram's girl friend" .)

I've seen this clue in The New York Times.

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