Literally, empty orchestra (7)
I believe the answer is:
karaoke
'literally empty orchestra' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for karaoke that I've seen before include "Pub fun in which one sings to backing track" , "Amateur singing entertainment" , "Entertainment singing to recorded backing tracks" , "Pub entertainment in which customers sing to taped music" , "Form of singing entertainment in pubs" .)