Crossword Genius

Why the police station is inundated by delinquents? (5,4)

Ross

I believe the answer is:

crime wave

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'why' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for crime wave that I've seen before include "Sudden rise in offences" , "Sudden rise in illegal acts" , "series of offences" , "Sudden rise in the rate of law-breaking" , "We arm vice (anag)" .)

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