Why the police station is inundated by delinquents? (5,4)
I believe the answer is:
'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)" .)