You and I say we follow the final double-N to boredom (5)

I believe the answer is:

ennui

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'to boredom' is the definition.
(synonyms)

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

(Other definitions for ennui that I've seen before include "French boredom and lassitude" , "boring" , "Result of boredom" , "Feeling of listlessness" , "Weariness with life" .)

I've seen this clue in the Sydney Morning Herald.

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