Singer of "Into the Unknown" in "Frozen II" (4)
I believe the answer is:
elsa
'singer of into the unknown in frozen ii' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for elsa that I've seen before include "___ Schiaparelli, Italian-born French fashion designer d. 1973" , "Girl" , "Lioness (born free in Kenya)" , "Famous lioness" , "Big cat" .)