Outright greed corrupts border (4)

I believe the answer is:

edge

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'border' is the definition.
(I know that border can be written as edge)

I can't explain the rest of the clue.

(Other definitions for edge that I've seen before include "Create borders" , "Border; intense quality" , "Creep" , "Border - advantage" , "Golden ingot" .)

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

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