Banks to catch crook and relax (5)

I believe the answer is:

chill

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'relax' is the definition.
(I've seen this in another clue)

I can't explain the rest of the clue.

(Other definitions for chill that I've seen before include "Unpleasent coldness in the air" , "Make cold (or frightened)" , "Preserve by cold" , "A feeling of coldness" , "minor illness" .)

I've seen this clue in the Sydney Morning Herald.

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