West Side Story heroine (5)
I believe the answer is:
maria
'west side story heroine' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for maria that I've seen before include "Black --, -- Theresa" , "Plains on the moon; girl's name" , "Heroine of West Side Story" , "musical" , "(Of plant) become limp" .)