One Roman leader among centurions deployed for fighting in the streets (12)

I believe the answer is:

insurrection

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'fighting in the streets' is the definition.
The answer and definition can be both acts as well as being singular nouns.
Maybe you can see a link between them that I don't see?

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for insurrection that I've seen before include "Violent uprising" , "Revolt" .)

I've seen this clue in the Irish Times (Crosaire) and the Irish Times.

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