UN opposer (anag) — by design (2,7)

I believe the answer is:

on purpose

(Other definitions for on purpose that I've seen before include "Deliberately, intentionally" , "Deliberately, with firm intent (2.7)" , "Deliberately, with full intent" , "Oppose run with deliberate intention" , "Pours open - quite deliberately (2,7)" .)

I've seen this clue in The Guardian.

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