Crossword Genius

All sent one quiz, essentially it's boredom (5)

Ross

I believe the answer is:

ennui

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'it's boredom' is the definition.
(synonyms)

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

Can you help me to learn more?

(Other definitions for ennui that I've seen before include "Listless boredom" , "Boredom, tedium" , "doldrums" , "Bored listlessness" , "Sense of tedium" .)

I've seen this clue in The Independent.
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