Administrative Officer catches delegate going over work? (5)
I believe the answer is:
opera
'work?' is the definition.
(musical work)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for opera that I've seen before include "Patience, for example" , "La Scala production, perhaps" , "works in Latin" , "Drama with singing" , "Falstaff, say" .)