19 across
Beautiful
girl
whose
twin
perished
(4,5)
Beautiful girl whose twin perished (4,5)
hints
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The definition is at the beginning of the clue.
How the clue works
Here Beautiful girl points to the fairy-tale heroine. The word "perished" is the anagram signal, telling us to rearrange the letters of "whose twin", which shuffle neatly into SNOW WHITE.