Elsa's sister, in Frozen (4)
I believe the answer is:
anna
'elsa's sister in frozen' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for anna that I've seen before include "-- Karenina, Tolstoy novel" , "- - Kournikova (tennis)" , "Book by Tolstoy" , "- - Ford (TV)" , "She's a woman, whichever way you look at it" .)