Extortion that might leave us in the dark? (8,7)

I believe the answer is:

daylight robbery

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'extortion' is the definition.
(daylight robbery can mean an extortionate practice)

I can't explain the remainder of the clue.

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(Other definitions for daylight robbery that I've seen before include "Blatant overcharging" , "A shameless swindle" , "audacious act of exploitation" , "Extortion" , "Scandalous" .)

I've seen this clue in The Independent.

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