Crossword Genius

It isn't corruption - it is corruption (5)

Ross

I believe the answer is:

taint

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'it isn't' is the definition.
(I've seen this before)

I don't understand the rest of the clue.

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(Other definitions for taint that I've seen before include "Stigmatise" , "Defile" , "Source of infection" , "contaminant" , "Defect - contamination" .)

I've seen this clue in The Globe and Mail.
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