Crossword Genius

Confrontational poem used in commercial (7)

Ross

I believe the answer is:

adverse

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

I don't understand the remainder of the clue.

(Other definitions for adverse that I've seen before include "In an opposing direction" , "negative result" , "Dire" , "Unfavourable - red vase (anag)" , "Hostile" .)

I've seen this clue in The Independent.
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