Crossword Genius

Last of air removed from high cloud and carbon injected as entertainment (6)

Ross

I believe the answer is:

circus

'entertainment' is the definition.
(circus is a kind of entertainment)

I don't understand the rest of the clue.

(Other definitions for circus that I've seen before include "Roundabout for the animal acts" , "entertaining show" , "'Travelling company of clowns, acrobats etc (6)'" , "tented area" , "Roman sporting arena" .)

I've seen this clue in The Guardian.
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