Rhyming, or the opposite (7)

I believe the answer is:

inverse

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'the opposite' is the definition.
(synonyms)

I can't explain the rest of the clue.

(Other definitions for inverse that I've seen before include "Upside down - opposite in effect" , "Reversed in order or relation" , "A direct opposite" , "Antonym" , "The exact opposite of enviers" .)

I've seen this clue in The Daily Express.

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