Crossword Genius

Big orchestral piece provides a clue to one such former musician (6)

Ross

I believe the answer is:

prince

'former musician' is the definition.
(deceased American musician)

I don't understand the remainder of the clue.

(Other definitions for prince that I've seen before include "Canadian province" , "Senior male member of a royal family after the sovereign" , "King's son" , "Son of a royal house" , "He's a royal" .)

I've seen this clue in the Independent.
Want a hint initially instead of a full solution? Install my app