Show nothing of musical composition (8)
I believe the answer is:
concerto
'musical composition' is the definition.
(I've seen this before)
'show nothing' is the wordplay.
'show' becomes 'concert' (concert is a kind of show**).
'nothing' becomes 'o' (looks like zero - 0).
'concert'+'o'='CONCERTO'
'of' acts as a link.
(Other definitions for concerto that I've seen before include "Piece for soloist and orchestra" , "Composition for accompanied soloist" , "Orchestral composition" , "10 [COMPOSITION]" , "Solo/orchestra piece" .)