Old prison — needs this after violent breakout? (7)

I believe the answer is:

newgate

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'old prison' is the definition.
(former London prison)

I can't explain the rest of the clue.

(Other definitions for newgate that I've seen before include "Stir in capital" , "Notorious 18th-century London prison" , "Old London prison" , "Prison formerly standing on site of the Old Bailey" , "London street" .)

I've seen this clue in The Times.

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