Crossword Genius

Macron's expression of boredom? (5)

Ross

I believe the answer is:

ennui

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'boredom?' is the definition.
(I know that boredom can be written as ennui)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for ennui that I've seen before include "World-weariness" , "What's tedious and instils such listlessness" , "Sense of tedium" , "Listless boredom" , "doldrums" .)

I've seen this clue in The Telegraph.
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