Location for shooting singular rock opera needs backing (2,6)
I believe the answer is:
ok corral
'location for shooting' is the definition.
'singular rock opera needs backing' is the wordplay.
'needs' indicates the answer is hidden within the clue.
'backing' says the letters should be written in reverse.
'larrocko' is hidden within 'singular rock opera'.
'larrocko' back-to-front is 'OK CORRAL'.
(Other definitions for ok corral that I've seen before include "Site of famous gunfight in Tombstone" , "Scene of 16 in 19" , "shooting scene" , "Tombstone feature" .)