Crossword Genius

Picking up waste after perform­ing is pure tedium (5)

Ross

I believe the answer is:

ennui

'pure tedium' is the definition.
(ennui is boredom or dissatisfaction)

I don't understand the remainder of the clue.

(Other definitions for ennui that I've seen before include "Weary feeling" , "Boredom, tedium" , "Result of boredom" , "doldrums" , "Effect of boredom" .)

I've seen this clue in The Guardian.
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