"The Mikado,” for one (8)
I believe the answer is:
operetta
'the mikado for one' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for operetta that I've seen before include "Light entertainment" , "G&S work, perhaps" , "Light opera" , "Singing" , "Eg, The Gondoliers" .)