Milan opera house (2,5)

I think it could be either:

Which length description are you looking for?:

2,5

la scala

'milan opera house' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for la scala that I've seen before include "Milanese opera house" , "A Callas seen in famous Milan opera house" , "noted venue?" , "music centre" , "place to sing" .)

I've seen this clue in the LA Times, The Wall Street Journal, The Telegraph and The Sunday Times.

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