Young fellow with articles about brass chamber piece (8)
I believe the answer is:
sonatina
'chamber piece' is the definition.
'sonatina' can be an answer for 'piece' (I've seen this before). I am unsure of the 'chamber' bit.
'young fellow with articles about brass' is the wordplay.
'young fellow' becomes 'son' (male child).
'with' says to put letters next to each other.
'articles' becomes 'aa' (the English indefinite article written twice).
'about' means one lot of letters goes inside another.
'brass' becomes 'tin' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'aa' going around 'tin' is 'atina'.
'son'+'atina'='SONATINA'
Can you help me to learn more?
(Other definitions for sonatina that I've seen before include "Piece of music" , "Simple musical work" , "little work" , "short composition" , "Short instrumental piece" .)