Urban guerrilla's report (4)

I believe the answer is:

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This might be a double definition.

'urban guerrilla's' is the first definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.

'report' is the second definition.
(report can mean a loud noise)

Can you help me to learn more?

(Other definitions for bang that I've seen before include "precisely" , "Slam" , "drug injection" , "Hairstyle" , "Straight fringe of hair" .)

I've seen this clue in the Evening Standard.

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