Orchestral performance: singer Rita's Brazil-bound? (8)
I believe the answer is:
oratorio
'orchestral performance' is the definition.
'singer rita's brazil-bound?' is the wordplay.
'singer rita' becomes 'Ora' (Rita Ora the English singer-songerwriter).
'brazil-bound?' becomes 'toRio'.
'ora'+'torio'='ORATORIO'
(Other definitions for oratorio that I've seen before include "Sacred, dramatic music" , "Composition for singers and orchestra" , "Outlying part of city" , "Noted work" , "Music for many performers" .)