Boy band with endless patter (9)
I believe the answer is:
stripling
'boy' is the definition.
(I've seen this before)
'band with endless patter' is the wordplay.
'band' becomes 'strip' (both can mean a small piece of material).
'with endless patter' becomes 'ling' (I can't justify this - if you can you should believe this answer much more).
'strip'+'ling'='STRIPLING'
Can you help me to learn more?
(Other definitions for stripling that I've seen before include "Young man" , "Lad" , "Young 'un" , "Youth" , "youngster" .)