Take unfair advantage of don (3,2)

I believe the answer is:

put on

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'don' is the definition.
(I know that don can be written as put on)

I can't explain the rest of the clue.

(Other definitions for put on that I've seen before include "Donned" , "Assume < present" , "Affixed" , "Don; mount (a play)" , "in an unnatural way" .)

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

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