She has many a song in West Side Story (5)
I believe the answer is:
Here is my best explanation:
'she' is the definition.
'many a song in west side story' is the wordplay.
'many' becomes 'm'.
'a song in west side story' becomes 'aria' (I can't justify this - if you can you should give a lot more credence to this answer).
'has' is the link.
Can you help me to learn more?