Quiet words in leading songs (6)
I believe the answer is:
asides
'quiet' is the definition.
Although both the answer and definition are nouns, they are not in the same form of the noun.
'words in leading songs' is the wordplay.
'words' becomes 'aside' (aside is a kind of words).
'in leading songs' becomes 's' (I can't explain this - if you can you should give a lot more credence to this answer).
'aside'+'s'='ASIDES'
Can you help me to learn more?
(Other definitions for asides that I've seen before include "Stage whisper" , "Stage whispers" , "Words spoken so that certain people won't hear" , "Incidental remarks" , "throwaway comments" .)