How a poet writes upside down (7)

I believe the answer is:

inverse

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'upside down' is the definition.
(I've seen this before)

I don't understand how the rest of the clue works.

(Other definitions for inverse that I've seen before include "Reversed in position like enviers" , "Transposed" , "Opposite in direction" , "A direct opposite" , "Upside down - opposite in effect" .)

I've seen this clue in The Irish News.

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