Being broadcast? Extract from Wagnerian opera coming up (2,3)
I believe the answer is:
on air
'being broadcast?' is the definition.
(on air on radio or TV)
'extract from wagnerian opera coming up' is the wordplay.
'extract from' indicates a hidden word (some letters extracted from the clue).
'coming up' says the letters should be written backwards.
'riano' can be found hidden inside 'wagnerian opera'.
'riano' back-to-front is 'ON-AIR'.
(Other definitions for on air that I've seen before include "Walk in delight here" , "Broadcasting at this moment" , "Broadcasting live" , "If you're really happy, you'll float here" , "(Walking) elatedly" .)