Ignoring Wagner initially, make do with baroque opera (3,6)
I believe the answer is:
the mikado
'opera' is the definition.
(I've seen this before)
'ignoring wagner initially make do with baroque' is the wordplay.
I cannot quite see how this works, but
'make' could be 'do' (do can mean to make or prepare) and 'do' is found in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for the mikado that I've seen before include "musical entertainment" , "comic opera" , "Gilbert and Sullivan operetta" , "musical drama" , "Eighteen eighty five G&S operetta" .)