If it's not prose, it's this - the opposite (7)

I believe the answer is:

inverse

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'the opposite' is the definition.
('inverse' can be a synonym of 'opposite')

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for inverse that I've seen before include "Something the exact opposite of another" , "Reversed in position like enviers" , "Transposed" , "Opposite in direction" , "Antonym" .)

I've seen this clue in The Independent.

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