Cryptic crossword clue
Imperial Europe has changed, protecting old theatre in London 5,5,5

The most common and most likely answer to this crossword clue is the 5 plus 5 plus 5 letter word ROYAL OPERA HOUSE

I've seen this crossword clue in The Daily Telegraph
R
O
Y
A
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E

Buddy explains!

The straight part
We know that "theatre in London" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case theatre in london = royal opera house.
The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.
This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.

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