In prose? The opposite (7)

I believe the answer is:

inverse

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'the opposite' is the definition.
(synonyms)

'in prose?' is the wordplay.
'prose?' becomes 'verse' (I can't justify this - if you can you should believe this answer much more).
'in'+'verse'='INVERSE'

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(Other definitions for inverse that I've seen before include "Reversed in order or relation" , "Opposite in direction" , "Upside down - opposite in effect" , "Something the exact opposite of another" , "The exact opposite of enviers" .)

I've seen this clue in The Times.

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