Finally hears alto section performing one of these (4)
I believe the answer is:
song
'one of these' is the definition.
The definition suggests an adverb but the answer is not.
'finally hears alto section performing' is the wordplay.
'finally' says to take the final letters.
The final letters of 'hears alto section performing' are 'SONG'.
Can you help me to learn more?
(Other definitions for song that I've seen before include "Piece of music, usually with words" , "Ditty" , "Musical number" , "Lied" , "See 17" .)