Crossword Genius

Barriers against crooks? (6)

Ross

I believe the answer is:

fences

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'barriers' is the definition.
(fence is a kind of barrier)

I can't explain the rest of the clue.

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(Other definitions for fences that I've seen before include "Good ones make good neighbours, they say" , "items for negotiation" , "Avoids directly answering" , "Uses a foil" , "Hedges and barriers" .)

I've seen this clue in the Evening Standard.
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