Crossword Genius

To Lynch, for instance, in the stadium, a Mexican type of concern for the police (5,4)

Ross

I believe the answer is:

crime wave

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'police' is the definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.

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

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(Other definitions for crime wave that I've seen before include "Surge in lawbreaking" , "series of offences" , "multitude of sins" , "Sudden rise in offences" , "Busy time for law" .)

I've seen this clue in The Irish Times.
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