The report will have unwelcome results (8)

I believe the answer is:

backfire

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'the report' is the definition.
(I've seen this before)

I cannot understand how the rest of the clue works.

(Other definitions for backfire that I've seen before include "Be self-defeating" , "Rebound on oneself" , "Cause a result opposite to that intended" , "Have the opposite and damaging effect to that intended" , "Boomerang" .)

I've seen this clue in the Evening Standard.

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