Opera video shows backing singer (4)
I believe the answer is:
diva
'singer' is the definition.
(diva is a kind of singer)
'opera video shows backing' is the wordplay.
'shows' indicates the answer is hidden within the clue.
'backing' says the letters should be written backwards.
'avid' is hidden within 'opera video'.
'avid' in reverse letter order is 'DIVA'.
(Other definitions for diva that I've seen before include "A female opera singer" , "Prima donna, woman opera singer" , "Long narrow top" , "demanding woman" , "Grand female singer" .)