Shady dealers meet such barriers (6)

I believe the answer is:

fences

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

I don't understand the rest of the clue.

(Other definitions for fences that I've seen before include "Receives" , "Kind of barriers, or dealers in stolen goods" , "Enclosing barriers" , "Engages in swordplay or processes stolen goods" , "Barriers to keep in or out" .)

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

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