Crossword Genius

Confrontational poem used in commercial (7)

Ross

I believe the answer is:

adverse

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Here is my best explanation:

'confrontational' is the definition.
(adverse can mean opposing something)

I don't understand the remainder of the clue.

Ross

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This clue was last seen in The Independent

(Other definitions for adverse that I've seen before include "'Unfavourable, contrary (7)'", "Inopportune", "Red vase (anag.)", "Unfavourable - red vase (anag)", "Evaders being harmful", "negative result", "'Contrary, untoward (7)'", "Inimical", "inopportune" and "Hostile".)

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