Composition for a boy to perform (5)
I believe the answer is:
rondo
'composition' is the definition.
(I have seen 'Musical composition ' mean 'rondo' so perhaps 'composition' could also mean 'rondo')
'a boy to perform' is the wordplay.
'a boy' becomes 'ron' (**).
'to perform' becomes 'do' ('do' can be a synonym of 'perform').
'ron'+'do'='RONDO'
'for' acts as a link.
(Other definitions for rondo that I've seen before include "Musical piece with returning theme" , "Piece of music with recurring theme" , "Musical composition with a recurring theme" , "Repetitive musical form" , "Type of movement" .)