Dismissive comment about promotional material in songs (7)
I believe the answer is:
ballads
'songs' is the definition.
(I know this)
'dismissive comment about promotional material' is the wordplay.
'dismissive comment' becomes 'balls' (I can't explain this - if you can you should believe this answer much more).
'about' means one lot of letters goes inside another.
'promotional material' becomes 'ad' (ad is a kind of promotional material).
'balls' enclosing 'ad' is 'BALLADS'.
'in' acts as a link.
Can you help me to learn more?
(Other definitions for ballads that I've seen before include "Soppy songs!" , "Popular songs" .)