Crossword Genius

Song Frau von Trapp won't start (4)

Ross

I believe the answer is:

aria

I'm a little stuck... Click here to teach me more about this clue!

'song' is the definition.
(aria is a kind of song)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for aria that I've seen before include "Nessun Dorma, for example" , "Puccini item" , "Imitative art work" , "Operatic air" , "part of opera, maybe" .)

I've seen this clue in The Sun and The Telegraph.
Want a hint initially instead of a full solution? Install my app