Famous opera house in Milan (2,5)
I believe the answer is:
la scala
'famous opera house in milan' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for la scala that I've seen before include "Italian opera house" , "noted venue?" , "music centre" , "A Callas may find way to Milan's famous opera house" , "A Callas seen in famous Milan opera house" .)