Covent Garden offering (5)
I believe the answer is:
opera
'covent garden offering' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for opera that I've seen before include "E.g. Falstaff, Fidelio" , "Lulu, say" , "Musical dramatic work" , "Lohengrin, say" , "Norma, say" .)