Redirect broken item on piece (12)
I believe the answer is:
divertimento
'piece' is the definition.
(I know that divertimento is a type of composition)
'redirect broken item on' is the wordplay.
'redirect' becomes 'divert' (I've seen this in another clue).
'broken' indicates anagramming the letters.
'item'+'on'='itemon'
'itemon' with letters rearranged gives 'imento'.
'divert'+'imento'='DIVERTIMENTO'
(Other definitions for divertimento that I've seen before include "Piece of music" , "Light musical piece" , "Light orchestral work" .)