Cryptic crossword clue
Riot dispersed with tear gas around the northern entrance to the Tower 8,4

The most common and most likely answer to this crossword clue is the 8 plus 4 letter word TRAITORS GATE

I've seen this crossword clue in Independent
T
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Buddy explains!

The straight part
We know that "entrance to the Tower (of London)" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case entrance to the tower (of london) = traitors gate.
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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