Stadium music featuring ELO post-break-up, making comeback (8)
I believe the answer is:
coliseum
'stadium' is the definition.
(coliseum is a kind of stadium)
'music featuring elo post-break-up making comeback' is the wordplay.
I cannot really understand how this works, but
'music' could be 'e' and 'e' is found within the answer.
'up' could be 'is' (I've seen this in other clues) and 'is' is found within the answer.
This may be the basis of clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for coliseum that I've seen before include "Large theatre or stadium" , "London opera house" , "Large amphitheatre" , "'Large tiered stadium, in Rome say (8)'" , "Large venue" .)